Solving Quadratic Inequalities: The Easy Way! Grade 9 Math by Teacher Gon

Solving Quadratic Inequalities: The Easy Way! Grade 9 Math by Teacher Gon
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[@jin_cotl]

14:20 x² + 7x + 10 ≤ 0 -> set the equation equal to zero so you can find x, although it isn’t necessary as I’ve seen other teachers leave it unchanged. x² + 7x + 10 = 0 -> (x+2) (x+5) = 0 -> x+2=0, x+5=0 -> x = -2, x = -5 Critical points: x = -2, x = -5 Draw a number line. Select a random number to the left of -5, a number between -5 and -2, and a number to the right of -2. I selected numbers closest to -5 and -2. Starting from the left, each section of the number line, around or between -5 and -2, will be false, true, false. Interval notation: [-5, -2] (by looking from left to the right of the number line) Inequality: x ≥ -5 OR x ≤ -2 (if the line goes left, x is ≤ smaller than or equal to, if line goes to the right, x is ≥ greater than or equal to) I prefer to write the inequality after graphing on the number line. So, the answer should be somewhere between -5 and -2 lol I could be a good tutor, I just learned this today :0

[@jin_cotl]

13:23 another video from Organic chemistry tutor said to use [-5,2], because they’re fixed points. You only use () if there’s an infinity included, like (-∞, 5] if someone could explain that’d be great. Okay so now I understand after I did some research; you always write ( ) with infinities, but if an inequality has a ≥ (greater than or equal to) or ≤ (less than or equal to), the number is included on the number line, which ● a filled circle is marked above the number on the number line, so we use [ ] around that number in the interval notation. If the equation only has < or >, the number isn’t included on the number line, which ○ is drawn above the number, we use ( ) around the number in interval notation. If there’s a variety of ≥, ≤, in an inequality equation, we use ( ) and [ ] depending on which number is behind each sign.

[@yyylenaa]

i was wondering too! how to use the symbols. So this comment helped me, tysm.

[@jin_cotl]

This video seriously helped me. I think it’s better for people who are reviewing this subject than learning for the first time as the video skipped slightly

[@verjiniafetalvo5741]

Gread 9 po ako sa dalig national high school sa antipolo

[@MathTeacherGon]

Hello keep on learning... I hope na mashare nyo ito sa classmates mo

[@zackgenesis4335]

Grade 9 St. Therese of Calcutta, University of Perpetual Help System, biñan campus

[@MathTeacherGon]

malapit lang sa akin.. I am from Carmona Cavite...

[@StormRamirez669]

Me in School: *Doesn't understand anything* Me watching Teacher Gon: *Understands everything*

[@steve_l6571]

Me too mate, I have exams in 1 month and 1.5 weeks and I need to study in order to go to 10th grade

[@MARGZCAMENERO-sl1fd]

Grade 9 Molave, Taguibo Mati City Davao Oriental❤

[@MathTeacherGon]

Wow.. keep it up!

[@weekomax]

Grade 9-Acts (Crack) from Misamis Oriental General Comprehensive High School (MOGCHS)

[@MathTeacherGon]

Keep on learning here.

[@yunoasta-xu1ig]

Hello sir new watcher here!i am a grade 9 student of 9 mulawin from Fe Del Mundo National High school in Mansalay Oriental Mindoro,thank you for making this,it helped me a lot!:)

[@jesicanajaran84]

Grade 9 Wealth of Nations Ednas School Dagupan

[@g25sualogsomiyya39]

Grade 9 Abu Hurayrah, Al Munawwara Islamic School, Davao City

[@andreiarlantico1219]

G. 9-Euclid Regional Science High School III present po

[@shandrell]

Grade 9 St Rita Of Cascia, St Nicholas Chatholic School Of Mariveles

[@sasunaru_official8073]

Section 1 po grade 9-Diamond in VICTORIAS NATIONAL HIGH SCHOOL(VNHS) in negross occidental

[@LiyahLavigne]

Halah diamond rin name ng section mo haha

[@hanchmt2823]

May natutunan ako sir kaso makalimutin utak ko eh hahaha

[@xX_AL_Xx]

grade 9 Neptune sa Jamindan National High School (JNHS) new ako sa channel na to

[@jammyeun5417]

Grade 9 Ruby TNHS!! Im advance reading because i have problems understanding math i hope to improve moree and the video really helped me to understand thankyouuuu teacher gon

[@lijjjuo9336]

eyy I’m also grade 9!!! goodluckkk!!!

[@heriellemay]

tysm nalilito ako knina sa class now gets ko na tysm sir

[@JerickOlasiman]

Section 1 po ako grade-9 perseverance Luyang National High School (LNHS) in san remigio cebu, marami akung natutu sayu sir thankyou❤

[@mvsy203]

Sir ask lang po, may video po ba kayo paano i-solve ganitong proble? If set A = {1,3,5,7}, set B = {1,4,7}, find the value of A - B

[@gr4y185]

Download mo askAI at mga iba pang AI tulad ng bing

[@meveryslimy2296]

Thx

[@user-bj6pj3mk5g]

For example po x²+10

[@PeteManabat]

Galing teacher! Parent here!

[@MusicMixer123]

Grade 9 Mendeleev CDLI Binan po

[@friiholike2942]

Awesome I learned a lot😊

[@MathTeacherGon]

Glad it was helpful!

[@raymundking5723]

pano naman po kung coefficient yung x2 like may kasamang number like ganto po 2xsquare+2x-3??

[@rainielcorpuz7252]

Hello po

[@nnojclips1895]

what if theyre both Negative What number should i chose If not 0

[@nasvaa]

choose for a smaller number so easier to solve!

[@user-md4mr9vz7y]

Thank you poo

[@jasimharoon5335]

Great..like it. Sometimes you use different language.

[@ayomidebabajide3308]

tysm this is so helpfulll as for the less than sign can it just be changed to = to like that at any time a quadratic inequality??could I do that to any quadratic inequality?

[@ayomidebabajide3308]

and is this how u end it in every equation on the lines

[@jin_cotl]

Yes. But make sure not the entire steps, and only the beginning to find what x equals

[@ayomidebabajide3308]

for the interval notation are negative 5 and 2 meant to b next together because they are x,x I thought ut was only. x,y

[@jin_cotl]

In this case, the interval notation is only showing what numbers there are. The (x,y) are excluded in this case.

[@ThanhNhan_GiaSu234]

Hi❤❤❤

[@kentcedrickdhenielvilano5858]

G9-Diana MSEU HS Salamat po Sr tinulungan nyo po ako sa monthly exam😎👍

[@jonimhemhie3836]

Section ko po ay JADE nag aaral po ako sa ilo ilo miagao national high school yan lng po

[@YeyTan]

Wow gets kona

[@YeyTan]

Ms naintindihan p kta kesa sa teacher ko

[@jasarenoashleyvignem.3749]

Grade 9 ST.Peter the Apostle Liceo de San Pedro🎉

[@MrkisBroke]

how to solve po kung mas malaki ang constant term kaysa sa linear term?

[@ryanpancho1721]

Sir, good day, ang -5 is satisfies the quadratic inequalities, hindi po ba ito solution?

[@sussybeluga09]

Interval Notation: [-5,-2] Am I right?

[@hanchmt2823]

Postive 2

[@jin_cotl]

Peak ASMR

[@MusicMixer123]

Sa carmona cavite rin po ako naka tira... baka po nag kikita tayo

[@virginwithaids1471]

Thank you

[@ravielbeaumontd.clarin6524]

14:13 Section A: False Section B: True Section C: False Edit: Tama ba sir? hehe

[@poobah2938]

interval notation [-5, -2]

[@jibeeunzziin2218]

Section A: false Section B: true Section C: true

[@sophieseego9502]

Paano po kapag 2x² po Yung quadratic term?

[@Imissyousomuchloveyoumwa]

(2x + _ ) (1x - _ ) po

[@nicsusm.315]

sir ask ko lang po yung sa bandang 6:35 sa set b na 0 minus 2= -2 ask ko lang po kung pano naging negative 2 yung sagot. sana mapansin

[@Andrealyzza12]

naging -2 sya kase mas malaki yung 2 kaysa sa 0 at ang 2 naman ay negative so susunod sya sa negative sign ng 2 kaya -2 yung sagot..at kapag e cancel mo lang ang 0 sa 0-2, -2 pa rin yung sagot...sana naka tulong po ito.

[@jasonj5599]

Hi Teacher Gon, ,can we use discriminant < 0 instead of factorising?

[@arianetutor9204]

What if less than equal to po paano po yun?

[@russianboi8524]

-10 is less than 2 yes pero why did we compare it to 2 im getting confused dapat ba lahat ng scenario na ganyan ma compared sa 2? so if yung number ay less sa 2 tama na agad?

[@jin_cotl]

I’m not sure what you mean, 2 isn’t being compared to -10

[@russianboi8524]

@@jin_cotl Eh late ka na kuya bagsak na ako sa 3rd quarter saka tapos na school year ko AHAHHAHGAHGAH

[@shadowlordgaming7094]

Section 1-False Section 2-True Section 3-True Tama po ba?

[@restartedv69]

bat dalawa true niyo?

[@margiejoy29binuya69]

mca gdes 9 me

[@sllygxrl4814]

transforming the equation into a quadratic equation using the sum and product of the roots pa toturial Po😭

[@WilliamrayEscarpe-on9bj]

Madali lang naman yan ah

[@jay-ju9vo]

​@@WilliamrayEscarpe-on9bjsya hindi nadadalian eh

[@nword8527]

Bobo. Ampota

[@gr4y185]

Ez

[@zeetsand]

What the heck did u just say

[@user-bj6pj3mk5g]

Panu kung hindi factorable ang number panu po isolve

[@laureencubelo99]

quadratic formula po

[@jin_cotl]

@@laureencubelo99what is po

[@jin_cotl]

Yes, I agree with the above, use quadratic formula