Learn how to solve quadratic equations by Completing the Square Method, a step-by-step tutorial. PreMath.com
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@giftyasare36025 жыл бұрын
My daughter is using this mathematics to solve her assignment Thanks for your help and support.
@PreMath4 жыл бұрын
You're very welcome Gifty Asare! Thank you so much for taking the time to leave this comment. I'm glad you liked it! Your feedback is always appreciated. Please keep supporting my channel. Kind regards :)
@hemanthsai54864 жыл бұрын
Good . But what Is the meaning of each step . Why we add the steps that we wanted , there should be some meaning right
@Niteshsir4 жыл бұрын
Plz watch m.kzbin.info
@xsageonexx73993 жыл бұрын
@@PreMath Why do you: A. Pull the 7/6 aside and B. Divide it by 2?
@lordkelvin100thompson83 жыл бұрын
@@xsageonexx7399 Take, for example; x + b Square it: (x + b)(x + b), and carry out the multiplication to get the product: x^2 + 2bx + b^2 In the example polynomial, the 7/6 coefficient is your 2b, so you need to divide by 2, or multiply by 1/2 to get the value of b to add to the L-value to produce a perfect square.
@ffggddss5 жыл бұрын
Or, in order to keep everything in integers for as long as possible, note that the middle coefficient is odd, so multiply by 4·6 (rather than by 6): 4·6·6x² - 24·7x = -24·8 12²x² - 2·12·7x = -192 12²x² - 2·12·7x + 7² = 49 - 192 (12x - 7)² = -143 x = (7 ± i√143)/12 Fred
@alicedeanhera8984 жыл бұрын
0
@BigWailz_official4 жыл бұрын
ffggddss :thanks so much sir,your explanation is so clear
@basharathussain72123 жыл бұрын
Genius
@CentaurisNomadus2 жыл бұрын
Now i got the point of denoting quadratic root of negative numbers. Thank you.
@vikg32282 жыл бұрын
Dumb question maybe but half of 2nd coefficient is 84, so don’t follow how you’re getting to 7squared instead of 84squared? Trying to relearn basic math to help my kids :). Thx.
@GillesF313 жыл бұрын
I'm French. I'm retired (after a professional career in data processing). I love mathematics (it doesn't mean I'm an expert of it :-) and I APPRECIATE A LOT your videos. Thanks to them we can approach a high level of problem resolutions as this one in which the irrational number i is used to get the solution. Congratulation and thank you for sharing with us your high level knowledge.
@Hertog_von_Berkshire3 жыл бұрын
9:16 When used as an operator, ± should be spoken as "plus or minus". "positive or negative" is correct only when ± is used as a sign.
@CentaurisNomadus2 жыл бұрын
Yeah, contexts. Our teacher from math would note that, just like in your comment.
@pillai213 жыл бұрын
6x^2-7x+8 =0, a= 6, b = -7, c = 8, -b = 7, b^2 = 49, 4ac = 4×6×8 = 192, b^2 -4ac = 48-192 = - 144 < 0 Since it is negative , this equation has no real roots.
@dmitrychaschev54892 жыл бұрын
Именно так, и квадрат числа не может быть отрицательным, какой же тупой автор видео
@ottolicha32133 жыл бұрын
For me it is very funny how you calculate the right side of the equation. You could do it like this: -4/3 + 49/144 = -192/144 + 49/144 = -143/144. Your way to do it seems like if a mountain hiker wants to reach the height of 1000 meters, so he goes up to 5000 meters and then comes down.
@vairnvain3 жыл бұрын
Same thoughts! I'm really bothered with how he added the fractions 😂
@tintinfan0072 жыл бұрын
Exactly.....
@breintankx3 жыл бұрын
Hello, I think you could also use: 1) D= b Square - 4ac Knowing D is your discriminant! 2) - b + square root of D = x1 3) - b - square root of D = x2 What do you think?
@PreMath3 жыл бұрын
Thank you so much King for your nice feedback. You are perfectly alright about the discriminant D= b Square - 4ac. I'm sure you are an awesome student 👍 Please keep sharing my channel with your family and friends. Take care dear and all the best😃
@ianmoseley99103 жыл бұрын
you must answer the question as written
@someone32852 жыл бұрын
D= -
@amramjose Жыл бұрын
Very well explained! Would using the quadratic formula result in the same answers?
@alzakiruyaqub1233 жыл бұрын
Wonderful! Can we always take the half of coefficient number by 1\2...? And also can we also directly write the number obtained when multiplied by the coefficient number without making it smaller?
@alzakiruyaqub1233 жыл бұрын
I mean can we always multiply the coefficient number by 1\2
@dannyasio86144 жыл бұрын
Excellent presentation. Thank you for this. I am now clarified that in finding a certain number to complete a square, we can possibly arrived on an imaginary number (ì). Kudos! Well explained.
@PreMath4 жыл бұрын
You're very welcome Danny! Thank you so much for taking the time to leave this comment. I'm glad you liked it! Your feedback is always appreciated. Please keep supporting my channel. Kind regards :)
@jihanjiji14 жыл бұрын
Good professor 🌷💐🌺🌺💐
@PreMath4 жыл бұрын
Thanks and welcome
@dennisphilip75963 жыл бұрын
Please make a video on real life use of limits , mathematical induction,complex numbers
@themanagementwarrior3 жыл бұрын
Hi. What lecture app and/or tablet did you use in your online lecture? Thanks.
@scottspartan93 жыл бұрын
Why did you divide 7/6 by 2? Please clarify.
@andywright88034 жыл бұрын
Solving with the equation is much simpler A=6, b=-7, c=8 X=(7+/-sqrt(49-4×6×8))/12 =(7+/-sqrt(49-192))/12 =7+/-sqrt(-143))/12 =7/12+/-sqrt(143)i/12
@lastchance81424 жыл бұрын
Thank you. This is correct
@BigWailz_official4 жыл бұрын
Please can you break down the simplification process so I can understand
@andywright88034 жыл бұрын
@@BigWailz_official the solutions to ax^2 + bx + c = (-b +/- sqrt(b^2 - 4ac))/ 2a. This seems quite complicated, but once you use it a couple of times, you find that unless factorisation is very simple, it's the simplest method, and I always find it simpler than completing the square. It works all the time and you can also tell very simply how many real solutions there are based on whether the value in the square root is positive (2), zero (1) or negative (0).
@truthseeker-7774 жыл бұрын
Andy Wright that might be so, but the whole point of the video was to show that the completing the square method could be used - as his student had asked him. It does also bring in the concept of the imaginary number rather nicely and also builds on knowledge of splitting number to root them which is convenient too, for building in and reinforcing concepts covered in earlier lessons.
@Ayushiteacher3 жыл бұрын
You explain very well👍
@jeffrey33063 жыл бұрын
Can you explain pls how and why are you dividing 7/6 by 2...where did you get that 2
@breintankx3 жыл бұрын
I don't know why he does that but you could also use: 1) D= b Square - 4ac 2) - b + square root of D = x1 3) - b - square root of D = x2
@3dbadboy12 жыл бұрын
Can you bring the answer all over 12 (because of common denominators) or does the inclusion of 'i' not make that possible? (7 + i(143)² ) / 12 and (7 - i(143)² ) / 12 .
@javierleon48953 жыл бұрын
Good!! Tell me what software do you use to write??
@PreMath3 жыл бұрын
Hello dear, we use Camtasia TechSmith package. Thanks for asking. Take care and stay blessed😃
@woni98344 жыл бұрын
Why can’t I use the method you taught, by doing (6x+1)(6x-8) and x = -1/6, or x _ 4/3?
@handrianoperwira26263 жыл бұрын
(6x-1)(6x+8) isnt equal to 6x²-7x+8
@patrickguillory75525 жыл бұрын
Anyone teaching equation should explain the rules........ Whenever someone understands the rules, everything becomes easy.
@chessandmathguy4 жыл бұрын
The rules?
@mikefrey66684 жыл бұрын
Pure bs dreamt up by some arab this shit is out dated
@kalyanbasak64942 жыл бұрын
X=1.876,-0.71 answer sharing, thanks sir,is it correct?
@henrydavis89103 жыл бұрын
Yes I can but why should I when using the quadratic formula is so much easier?
@PreMath3 жыл бұрын
Dear Henry, you are absolutely correct! However, getting to know more tools and techniques would give you more power! I'm sure you are an awesome student 👍 Please keep sharing my channel with your family and friends. Take care dear and all the best😃
@ianmoseley99103 жыл бұрын
The question asked specifically for this method - in an exam you would lose marks for ignoring that
@lordkelvin100thompson83 жыл бұрын
The quadratic formula is a generalized form of completing the square. Good to know that because I'm always forgetting the damn formula.
@johnnolen8338 Жыл бұрын
The quadratic formula is the result of CTS. If you become proficient at CTS then you'll not only know where the quadratic formula came from, the quadratic formula becomes completely unnecessary. CTS is faster.
@joelb93783 жыл бұрын
In germany we have something that's called pq-Formel: when you see this equation x^2 + qx + q = 0, you can do this: X = - p/2 +/- Squarerootof [ (p/2)^2 - q]
@MichaelRothwell14 жыл бұрын
May I suggest that when you combined the fractions, it would have been preferable to use the lowest common denominator, 144, rather than cross-multiplying, as this would lead to easier arithmetic with smaller numbers and avoid the need to cancel by sqrt(3) later.
@stelun563 жыл бұрын
Completing the square for this expression would be much better than beginning with the equation, as this also derives the coordinates for the vertex. If only roots are needed, then the formula is the obvious choice. Moreover, you should review adding fractions. -4/3 + 7^2/12^2 = -43/12^2. Only beauty lies in true mathematics.
@PreMath3 жыл бұрын
Thanks dear for the nice feedback. I really appreciate that. Take care dear and all the best😃 Have a very happy and blessed New Year!
@sonydeep59123 жыл бұрын
Why to fill c ( notation a, b and c) was b divided 2, where was 2 come from?
@larrypatterson39576 жыл бұрын
Since they have a common denominator, would you further simplify the solution as x = (7+i[143]^1/2)/12 and (7-i[143]^1/2)/12 ? Also, thank you for taking the time to show us this method. You have a very easy method of teaching that helps me to understand the material.
@PreMath6 жыл бұрын
Dear Larry Patterson , you are absolutely correct. You may simplify it further. As a Math professor, I'd accept both versions of answers as perfectly alright. Thanks for the feedback. I'll be uploading many more video lessons pretty soon. Kind regards
@JamesMiller-rb3eo5 жыл бұрын
Larry Patterson hi
@chadwickmeyer78445 жыл бұрын
Larry. I did this problem with my algebra class and then we watched the video together. Like you, we further simplified the final answer.
@everythinguwant47224 жыл бұрын
Thank you so much for your explanation. I'm from India 🇮🇳but I can understand your explanation comletely.👍
@PreMath4 жыл бұрын
You are very welcome Patel ji! Thank you so much for taking the time to leave this comment. I'm glad you liked it! Your feedback is always appreciated. Please keep sharing my channel with your family and friends. Take care dear and all the best😃
@paulmiller66472 жыл бұрын
This is so relaxing to the brain I feel loads just got lifted off my shoulders. I love getting a refresher on this; thanks very much for the link. It's been at least two years since I last did these equations.
@mustafasleiman2575 жыл бұрын
You kan simply solve it with (X= -b + and - √b squar - 4ac all over 2a, a as 6 ,b as -7 ,c as 8
@ReversePrimeOFFICIAL4 жыл бұрын
Mustafa Sleiman that’s not fun
@truthseeker-7774 жыл бұрын
That’s not what his student asked him to do.
@husseinelgandy62425 жыл бұрын
We can ×6# 36 x^2_42x+48=0 then (6x_7/2)^2=_47/2
@beartalon2 жыл бұрын
3 is a factor of 144. You only needed to multiply -4/3 by 48/48 and then add with 144 denominator. You could have saved steps there
@sk__gauravpatil83343 жыл бұрын
So best and great video but l am daily using video wow amazing sir l like you video
@احمدالسويداوي6 жыл бұрын
What is the program used to explain the lesson please reply
@PreMath6 жыл бұрын
Dear Ahmed, if you are talking about the software program, I use Camtasia Techsmith! All the best :)
@DoctorFashion4 жыл бұрын
Subscribed! Great explanation!
@PreMath4 жыл бұрын
Thank you so much! Please keep supporting my channel. Kind regards 😀
@michaelkaye49985 жыл бұрын
I’m long out of math. Like these videos to refresh my mind. What is the purpose of completing the square? Knowing the formula I would never bother with this. Is their a reason to?
@damnson13564 жыл бұрын
hahaahahahahahaha great question. well i guess teachers want us to fail, thats why
@archeopterixneuroza47154 жыл бұрын
it can help with maximums
@jihanjiji14 жыл бұрын
Good thanks
@PreMath4 жыл бұрын
Thank you too!
@sofab15494 жыл бұрын
question. Why do u need to flip over the 2 over 1?
@hichamroka94282 жыл бұрын
Good explication. Thanks
@aparnapatil723 жыл бұрын
Sir how to solve this equation by factorization
@sachinpai28863 жыл бұрын
You cannot take Square root of an expression. It has to be in simplified form. Else it should be in Modulus.
@prakasamkannadi76164 жыл бұрын
Step by step approach to answer is simply super.
@PreMath4 жыл бұрын
Thank you so much prakasam kannadi for taking the time to leave this comment. I'm glad you liked it! Your feedback is always appreciated. Please keep supporting my channel. Take care dear 😃
@leopoldkudzaishungudzemoyo55974 жыл бұрын
If we save the video to watch later how do we access it
@PreMath4 жыл бұрын
Click on save beside like, dislike, share button and select watch later checkbox. Thanks for asking. Take care :)
@theobserver3144 жыл бұрын
On laptop/Computer you go to the KZbin home page or simply put it www.youtube.com, then on your left side a column would appear, this column contains the following: "Home" "Trending" "Subscriptions" "Library" "History" "Your Videos" "Purchases" "Watch Later" "Show More" Click "Watch Later". If you're using mobile, upon opening the KZbin App there will be a row at the bottom that will contain the following: "Home" "Explore" "Subscriptions" "Inbox" "Library" Click "Library" Upon clicking "Library" You will than find "Watch Later".
@karnabudhathoki53115 жыл бұрын
@ around 4:10 you put (7/12)^2 On both sides. later you said what sign to put in between x and 7/12 whole square... It wasnt necessary...you simply should have said...its taking on the form of a^2 - 2ab+b^2. And will so...reduce to (a-b) ^ 2 .That way it would have been simpler....
@NileshKumar-yj4sb5 жыл бұрын
Explanation was very good. You please shutup
@theobserver3144 жыл бұрын
You are correct.
@artmiller23413 жыл бұрын
With two sheep flying, one yellow and the other heading right, how much does a pound of asphalt cost, given that the cow is 10 years old?
@GlossRabban3 жыл бұрын
It costs the taste of musik made from star dust.
@artmiller23413 жыл бұрын
@@GlossRabban lol
@gajavelliprincesses3 жыл бұрын
I don't understand why you have muliplied 7/6 with 2.
@寧靜致遠-h1r5 жыл бұрын
If ax2+bx+c =0, the solution of formula is -b+-✓ b2-4ac(radical symbol)/2a.
@cc-ic7rj5 жыл бұрын
Exactly right
@karimelsheikh32962 жыл бұрын
What is the name of boared please ??
@Glockperfection6662 жыл бұрын
This is to help me refreshing for my daughter’s pre calculus . Thank you very much !!!!
@shathaomar15165 жыл бұрын
Why did you take the number 7/6 and multiply or divided it by half n then put exponents 2?? Could not get this step plz
@rajakambing5 жыл бұрын
7x/12+7x/12=14X/12=7x/6
@HDitzzDH5 жыл бұрын
Shatha Omar He’s doing that so that we can write the left side as a perfect square, that’s one of the main steps regarding how to solve by ”completing the square”.
@djganit4 жыл бұрын
Very good presentation
@PreMath4 жыл бұрын
Thanks a lot :)
@raeesuddin56604 жыл бұрын
Can we multiply and divide the coefficient of x by 2 ?
@senpailegacy15836 жыл бұрын
I knew immediately that they were imaginary because the nature of the root (or the discriminatnt I.e. b^(2)-4ac) is less than zero so it must mean it has two imaginary solutions. Great video👍👍
@luisportella17605 жыл бұрын
hahaha who cares fucking knowitall hahaha
@vasilismagdabanos25425 жыл бұрын
Gauss.
@GurdeepSingh-yu4pt5 жыл бұрын
lol
@HDitzzDH5 жыл бұрын
luis portella You can’t comprehend such low level math? Hahaha.
@stormstrike18453 жыл бұрын
What happened to the -7/6x?
@kishalayamukherjee48675 жыл бұрын
Great video for learners like us. But perhaps you forgot to tell the learners when you used the formula (a - b)^2 = a^2 - 2ab + b^2 in the LHS equation : x^2 - 7/6.x+ (7/12)^2 = ( x - 7/12 )^2. Instead, you brought down the negative sign before 7/12 by drawing an arrow. This confused me a little in the first hand. Thanks.
@bhadra655 жыл бұрын
Exactly! I had the same confusion for a little while, too.
@mkwazir3 жыл бұрын
Amazing Good Well done Thank u sir
@adelekeolabiyi60953 жыл бұрын
Thank you so much I was able to challenge some people
@mshahkhan91783 жыл бұрын
need more explanation because why should we take square of 7/2. There is logic behind and this logic should be explain. good effort
@e10ln5 жыл бұрын
Could you tell me please what is the name of that programe you are using it for writing ?
@PreMath5 жыл бұрын
Camtasia! Thanks for asking. Kind regards :)
@profbenchahyd87764 жыл бұрын
please how to creat a matematics videos
@PreMath4 жыл бұрын
Dear Hassan, I use CamtasiaTechSmith utility for my videos. Take care😃
@profbenchahyd87764 жыл бұрын
@@PreMath Thank you so much
@PreMath4 жыл бұрын
@@profbenchahyd8776 My pleasure 😃
@truthseeker-7774 жыл бұрын
When I was first looking at completing the square quadratics a few weeks ago, I stumbled across this video and it nearly blew my mind. I’ve studied a bit since and just rewatched it and bingo! Makes glorious sense now. Thank you 😊 But if you are a beginner to completing the square, start with a simple few examples that don’t involve fractions, to build your understanding first.
@PreMath4 жыл бұрын
You are very welcome Lottie Bronte! Glad I could help you. Thanks for your comments. Please keep supporting my channel. Take care😃
@manojsurya10054 жыл бұрын
Can I just use quadratic formula?
@PreMath4 жыл бұрын
Sure, you can! I used the completing the square method because my student requested me that method. Thanks for asking. Take care dear and all the best 😃
@manojsurya10054 жыл бұрын
@@PreMath thank u
@philippemichel43303 жыл бұрын
Yes it’s simpler.
@carultch3 жыл бұрын
@@manojsurya1005 Completing the square is how the quadratic formula is derived in the first place. If all you are given in a problem, is to find the roots of the quadratic equation, you can use any method that is most convenient for you. If you are specifically told to use a particular method in the problem statement, you use that method.
@josegeonzon35956 жыл бұрын
Sir can you answer this one, f(x) = x^2+3x+2 by completing the square
@PreMath6 жыл бұрын
Dear Jose Geonzon, here is the solution: solve by completing the square x^2+3x+2 = 0 => x^2+3x = -2 => x^2+3x +(3/2)^2= -2 +(3/2)^2 => (x + 3/2)^2 = -2 + 9/4 => (x + 3/2)^2 = 1/4 => take the square root on both sides and solve for x => x=-1, x=-2 are our solutions :) Thus, you can write your function f(x) = x^2+3x+2 as in this form as well => f(x) = (x + 3/2)^2 - 1/4. Thanks for asking. All the best :)
@محمدحسن-ح6ث5ق2 жыл бұрын
Thank you for all this great knowledge
@motherof3pearls5 жыл бұрын
When completing the square, why do some KZbin Math teachers add the middle terms on the left hand side and to the right hand sides, while others minus the term they have just squared on the left hand side. You get two different answers, right. I just so confounded by which method to use. Please, help! Thank you 😃🤓
@shamskhan98914 жыл бұрын
You can use any method
@openyard4 жыл бұрын
I am a bit lost at 7:34, how did the square root of 429 become represented as square root of 3.143 and the square root of 423 become equal to the square root of 3.144?
@jeffweber82443 жыл бұрын
429 = 3 x 143 the dot was multiplication symbol, not a decimal point
@numeshmani21833 жыл бұрын
Divide:(12x^4-15x^3)÷3x^2 please
@Hertog_von_Berkshire3 жыл бұрын
1:28 "The next thing what we want to do" ... I'm so glad this isn't an English lesson ... "isn't it".
@kevinvu98026 жыл бұрын
Can you tell me which software you are using?
@PreMath6 жыл бұрын
Camtasia :)
@kevinvu98026 жыл бұрын
thanks
@RealSlopeDude6 жыл бұрын
Great video. As a math teacher myself, I love how you skipped no steps.
@PreMath6 жыл бұрын
MathGives YouPower , thanks for the honest feedback. We both are in this very noble teaching profession. Kind regards :)
@domjervis6 жыл бұрын
Love the You Tube name you use. Reminds me of one of my favorite Adages. "Math is a Wonderful Thing. Become good enough at it, and no one will EVER be able to fool you with demagoguery." As for this video, my 8th grade algebra teacher took us through a drill very similar to this one. I raised my hand and asked "Wouldn't it be easier to just apply the Quadratic Equation?" He replied "With an attitude like that, you'd be better off becoming an Accountant than a Mathematician." So I did LOL All best!
@leslieanderson64135 жыл бұрын
where did the 7/12 and 2/1 come from? I think I have frozen my brain. I love math; this has me stumped. I would make my dad, the math prof so proud :)
@jihanjiji14 жыл бұрын
Good
@PreMath4 жыл бұрын
Thank you so much! Please keep supporting my channel. Kind regards 😀
@jihanjiji14 жыл бұрын
@@PreMath ok my frand
@learnmathsezy16 жыл бұрын
Nice explanation. which application r u used thanks
@PreMath6 жыл бұрын
Thanks vinesh rathod for the feedback. Kind regards :)
@alejandroortiz42234 жыл бұрын
Very clear to me as a student... Tnx
@PreMath4 жыл бұрын
You are very welcome Oordnajela Zitro ! Thank you so much for taking the time to leave this comment. I'm glad you liked it! Your feedback is always appreciated. Please keep sharing my channel with your family and friends.Take care dear and all the best😃
@hilurisetemekila5054 жыл бұрын
How can you get =+or - I square root 3.143
@johnniegilkerson47246 жыл бұрын
@5:39 in video (-429/432) reduces to -(143/144)
@josefc83625 жыл бұрын
johnnie gilkerson hahaha, exactly
@FatimaZahra-on4po2 жыл бұрын
Sir i rude amount I don't understand where from we get
@gaBetibu6 жыл бұрын
Hi, thank you for your kind, helpful explanation, but I didn't understand why you divide the 2nd term (b term) by 2? Thank you, again . . . & God Bless . . .
@gaBetibu6 жыл бұрын
. . . oops, never mind, Sir . . . I just found the answer in one of your other super-great videos . . . Thank you so, so much, &, God Bless . . . :)
@PreMath6 жыл бұрын
Dear Glo Amador, you are very welcome. Thank you so much for taking the time to leave this comment. I'm sure you are an awesome student. Keep it up. Best regards :)
@joeblainey26275 жыл бұрын
what software is used for writing on the youtube board
@MathsclassKI5 жыл бұрын
Good question
@PreMath5 жыл бұрын
Camtasia! Thanks for asking. Kind regards :)
@johnbell31664 жыл бұрын
u cross multiply fractions? I thought u find like denominator and add the fractions? (-4/3+49/144)?
@TeWee.5 жыл бұрын
Im limited on my math. But why not split to binorminals and solve?
@channelsixtysix0662 жыл бұрын
In electronic engineering, " i " is replaced with " j ". The reason for that is, lower case " i " is the current symbol in AC circuits.
@rahinatufuseinu16623 жыл бұрын
So....please,why did you divide 7/6 by 2?
@vikramanvel3 жыл бұрын
Why don't you keep the captions what you talk on one side so that the steps by steps solution is not hidden.?
@cobra48835 жыл бұрын
how do you get sqrt3.143 equal to sqrt3 x sqrt143.
@swkit1255 жыл бұрын
Where?
@umamaheswari74463 жыл бұрын
L.C.M.of 3 and 144 is 144 so -4x48+ 49 gives -143/144
@kabonline095 жыл бұрын
very good explanation... you are really good teacher and not for duffers like some of those who commented below....
@amadoumbayediouf5 жыл бұрын
How to solve this equation please! 3 cos5x-4sin5x=3? I am Senegalese and l follow you great teacher Pape thanks you
@karnabudhathoki53115 жыл бұрын
I left teaching 7 years ago ..so I cannot give you solution right away..but I can give you ideas....since you dont have direct formulas for 5x but you do have formulas for 2x and 3x..so I think replacing 5x with 2x+3x is the right way to go...also there may be ( A-B) or ( A+B) formula scenarios....hope that helps...you ...Thanks...Nepal....
@HDitzzDH5 жыл бұрын
Amadou Mbaye Diouf I think that problem is incredibly difficult, I looked up the answer and it was: x = 2/5( π*n - arctan(4/3)), x = (2πn)/5, n ∈ ℤ.
@RobertoEmilioRomero5 жыл бұрын
Use the substitution sin(5x)=sqrt(1-cos^2(5x)). With some algebra together with the quadratic formula you should be able to solve. It you want the actual solution send me an email with the problem at Robertoeromero@yahoo.com Best,
@drmadhan763 жыл бұрын
Great sir.Thank you so much👍👏
@anjaneyasharma3223 жыл бұрын
6x^2 - 7x = --8 6x(x--7) = --8 Choose the right one from 1 x --8 --1 x 8 2 x --4 --2 x 4 and find value of X
@PreMath3 жыл бұрын
Thanks Anjaneya for your awesome feedback! Please keep sharing my channel with your family and friends. Take care dear and all the best😃
@marcosreal114 жыл бұрын
The steps would have been easier if you had just multiplied -4/3 by 48/48 (to get the 48, divide 144 by 3). Then if you are weak at fractions you could multiply both sides of the equation by 144.
@rohankhtrapal78893 жыл бұрын
I was also thinking the same
@vasundharakarant23573 жыл бұрын
At the beginning only you can use the formula as x=(-b±√(b^2-4ac))/2a
@hacker64xfn993 жыл бұрын
There is a : x² 1x = (x - ½)² - 1²/4 that is pretty easier ..
@johnvinton69934 жыл бұрын
Thanks to Po-Shen Lo (www.poshenloh.com/quadraticdetail/) the following is another elegant solution : If you find r and s with sum −B and product C, then x2+Bx+C=(x−r)(x−s), and they are all the roots • Two numbers sum to −B when they are −B/2±u • Their product is C when B2/4−u2=C • Square root always gives valid u • Thus −B/2±u work as r and s, and are all the roots So for the equation 6x2 - 7x + 8 = 0, we follow the following steps: Divide both sides by 6 resulting in x2 - 7/6x + 4/3 Two numbers that Sum to 7/6 are 7/12±u The product of the two numbers is (7/12 + u)(7/12-u)=4/3 Solving for you u as follows: 49/144-7u/12+7u/12-u2 = 4/3 49/144-u2 = 4/3 = 192/144 -u2 = 192/144 - 49/144 = 143/144 u2 = -143/144 u = (±i√143)/12 X = 7/12 (±i√143)/12
@bismaali6223 жыл бұрын
Just subscribed ! You are a life saver
@PreMath3 жыл бұрын
So nice of you Bisma dear! You are awesome 👍 I'm glad you liked it! Please keep sharing premath channel with your family and friends. Take care dear and stay blessed😃
@peterbyrne6394 Жыл бұрын
Thank you.
@PreMath Жыл бұрын
You're welcome!
@mathsfamily67663 жыл бұрын
Pretty good sir! Best explainer
@PreMath3 жыл бұрын
Thanks dear for the visit! You are awesome 👍 Take care dear and stay blessed😃 Kind regards
@sadhsarkar13233 жыл бұрын
Thank you.... thank you soooo very much sir......I was facing prblm in this thing for many days.... Thanks for clearing my doubt.........😊
@ReligiousReasoning2 жыл бұрын
144 and 3 have a lower common multiple 144
@garyleather64863 жыл бұрын
Mate this good can you tell me where would you use this in life i am not trying to be a smartarse can someone explain it to me