Domain and range of a function given a formula | Algebra II | Khan Academy

[@isabellarichardson423]

*I’m watching this through my tears lol*

[@Pynss]

SAME

[@apeacefulworldijustwant6471]

Why?

[@chylacookenmaster5570]

sameee

[@Ignatius-ok5kv]

@@apeacefulworldijustwant6471 Who knows? Perhaps she wasn't paying attention and had work to do. Maybe she has a bad teacher and Khan Academy is the only way for her to understand it. Maybe it's a combination of those two things.

[@sarashook124]

ME OMG

[@Xurik]

from the bottom of my heart, thank you for helping me throughout the years

[@juwairiyah9898]

:) he's a hero

[@Sss-mb5qs]

How is it going))

[@edwardg2086]

Starry Night good

[@sneaxonmic1041]

@@Sss-mb5qs Same Here

[@yaraaehab]

Plus one!

[@amircabrera8647]

y’all be really listening while im just reading comments and be like yeah it’s hard.

[@luc.b6951]

Lol same 😂😂

[@ciaraschick7334]

hahahah same😂

[@lovenhora]

Rt

[@PenandPaperScience]

I'm reading the comments to see whether I can help anyone out :)

[@mahadabdulkadir8807]

Fr fr

[@Batcaveqq]

Why does it feel like I'm always watching math videos but never actually retaining the information?

[@sonnyhines8249]

because thats whats happening

[@emilyc5441]

Bc our brain puts out information we don’t need

[@emilyc5441]

@Spla Dunctious it iz what it iz

[@4ssh4t]

@Spla Dunctious not really

[@4ssh4t]

@Spla Dunctious that’s cool, but that just means you need it, not me

[@hady141]

I'm watching this video and I still don't understand. God bless me.

[@braveimposter]

Same bro

[@sonukr.3155]

Can i explain to you You Wii definitely understand

[@hady141]

@@sonukr.3155 that was months ago. I understand it now. Thanks though👍👍

[@gingerfox5073]

@@hady141 I need help🥲🥲

[@garciaaustin6022]

HAHAHAHA😂👍

[@Teemabear]

I'm starting to think I have a learning disability.

[@Michael-us3xg]

me too lmao

[@katherinepiercestan6613]

Same

[@powersurge9301]

Nah it’s okay if you don’t get it right away just keep at it and I know you can win

[@draedre1043]

Me rn: When you got soo much work to do that you don't even have the time to cry :> Cheer up!! We can do this.

[@iantuleck9777]

Same

[@ilovehuhyunjin08]

Wow I learned this lesson in just 8 minutes while my prof was teaching for 1 hour I can't even understand a single thing. Thanks man, you're the real MVP!

[@tehreemj6350]

ayyy i found a kpop stan in a maths video

[@ilovehuhyunjin08]

@@tehreemj6350 I love kpop more than studying

[@Kratos-kt6yw]

@@ilovehuhyunjin08 ok lil guy

[@tahaahmed7364]

​@@Kratos-kt6ywaint nobody like studiying

[@tessa7676]

low-key freaking out cause I took a high level in math thinking i'd do well. But all i've learned so far is that I'm as smart as a rock :)

[@sarashook124]

you got this

[@katebanks3371]

mood af.

[@auz6880]

Lol

[@nuckchorris6351]

Dominix and Rangey, That's how my teacher put it to remind us that the domain=x an the Range=y

[@syedhashmi5004]

You and Failzor2 must be classmates

[@chrislomond5930]

+Nuck Chorris my teacher always talked about his friend deXter rileY

[@viinneett]

Wow lol u made tht more easy for me!

[@abcdefghijklmnopqrstuv0]

Gonna use that...

[@traelonin]

With all due respect, it’s not very hard to memorize what the meanings of two words are.

[@amdelrushjunebesquillo4325]

Im just smilling in emotional pain throughout the video.. and im trying yo learn this for online class😃. Then WHAAAAAT IS THE DOMAIN OF 3x²+6x-2 ?!! Aaaaaah

[@ash8421]

I'm trying to learn this for online school as well. There are multiple domains for the equation. The domains were the x values in the table that he made. The range was the answer to the equation after he plugged the x value into the equation.

[@lykafruelda5901]

All real numbers

[@triton6490]

all real numbers. for any x value that is real there is a y value that is real

[@jingy205]

its everything, cause literally nothing can break the function

[@morganballard6053]

Khan academy helped me do well on my placement test for college, and is now helping me get through my precalculus algebra and trig classes 💚💚💚 Thank you!!!

[@levi.a8492]

😅

[@alifardanqureshi2969]

I've been constantly trying to understand the domain and range from all kinds of different angles and i think I'm finally getting it. Don't give up, keep pushing

[@maddiern87]

not me crying right now because i have a test in a couple days and i was supposed to learn this forever ago

[@YafetZ]

did u pass? give me hope :(

[@vishnu-ph9sm]

Like Ur profile pic

[@brandonrobledo4281]

ik you commented this like year ago but did you understand it? if so please help me, because i have a test tomorrow and i’ve been out the whole week/unit so i don’t really understand it.

[@c̸2834-n7j]

fr

[@Ryan-fj5vq]

@@brandonrobledo4281 how was your test

[@joshuaisaiahnavarro3723]

when obama can teach you math

[@oneaviatiorandminecraft]

Joshua Isaiah Navarro ahhahahahahahahahahah this comment is lit😂😂😎😎

[@deontewilson9699]

Blueberry Cheesecake 555 stop

[@DdoubleB03]

Blueberry Cheesecake do you play chess?

[@DdoubleB03]

Because you are slightly late.

[@Phyto.]

lmao this had me rolling

[@kao4266]

My math teacher has not given the virtual students(my school is in person with the option to be online) a single lesson but still expects us to understand and do the homework. These videos are my only hope lol.

[@ninjapiggy1274]

i know you commented this a year ago but im going through the same thing, what did you do to get through it?? :)

[@kao4266]

@@ninjapiggy1274 What helped me honestly was using apps like Photo Math to solve an example question and then I'd try to figure it out myself

[@kao4266]

@@ninjapiggy1274 I also asked friends and tried to work it out with somebody

[@ninjapiggy1274]

@@kao4266 oo ill try that tysm :))

[@lolicon.8711]

lsgh?

[@izzyrobot52]

Why can't my math teacher teach this well?

[@aftonshumate2675]

Ikr! I had to watch that exact video last night!

[@toppointbusinessconsultanc4523]

Hi, I am a student of University of the People, I have really benefited a lot from your programs. Thank you so much for all your selfless efforts to help us as students. We have learned a lot.

[@comfortkabanshi5048]

That university is real?

[@toppointbusinessconsultanc4523]

@@comfortkabanshi5048 yes the university is real and has very amazing experience.

[@akirashalf3763]

When I have a quiz about this 20 mins from now but I still can't learn it 👁️👄👁️

[@epicdreamstime1464]

Any updates

[@Failzor2]

My teacher put it this way. Dominix and Rangey, Domain being x and range being y.

[@morganballard6053]

Thats really helpful, I'll remember that, thanks 😊

[@g_ssf-m]

W teacher

[@cloud6136]

r u still alive

[@fiksionfirst]

​@@cloud6136 lol

[@imsodunmer6585]

god i wish I had ur teacher

[@Cycy0978]

Why does my brain can't function when I heard the word math?

[@lilac_moon1457]

My brain does that toooooo. It completely turns off after hearing the word math.

[@luc.b6951]

@@lilac_moon1457 u didn't get it lol

[@lilac_moon1457]

@@luc.b6951 what?

[@pinkitydrinkity9425]

Fr I'm over here watch math vids for my test I'm doing and sont understand nothing

[@MovieTrailers909]

i just watched this before going to the exam YOU SAVED MY LIFE BROTHER MUCH LOVE TO YOU

[@Astra20284]

Funny Videos Of All Time hahahahahahaha

[@sandyzhao2706]

lmao what a mood but highkey true XD

[@leonifloraranas8222]

I wish my brain is like yours :(

[@rafaelsmdc]

Funny how i'm learning more from this channel than my PAID college.

[@xaxa9727]

we had this during grade 8 but I totally forgot all about it and because school just started we are reviewing past lessons. my teacher makes it really confusing and his grammar makes it a whole lot worse! thank you!! you're a life saver

[@harshitakanal7411]

Sal,your voice,makes me happy😃😃

[@patjackiecannon2490]

im just stupid I think, ive watched so many videos and I still don't understand

[@jackdaniels1749]

same bro, same

[@komarbat23]

Same

[@chezlieshaw3435]

Same

[@sulaiman7988]

SamER

[@PHILLYMEDIC69]

i find that khan academy is not the best channel for subjects. The organic chemistry tutor is the best because he teaches the basics and gives a bunch of examples of different types.

[@KiranKumar-nk1rs]

Thank U very much sir....I was very much confused with the Concept of Range.....but Now its clear as U explained it Graphically....Thank u very much once more sir.....Excellent !!!!

[@tapprincess4555]

Thank yooou! i have an exam in 3 days and this really helped!

[@josephadame3259]

what country are you from? my exam is also on Tuesday?

[@tapprincess4555]

+Joseph Adame Australia 🇦🇺

[@josephadame3259]

+Tapprincess45 ah, ok

[@tang3151]

My A level exam for Pure Mathematics 1 starts in less than 5 hours so this helped

[@tanjo4]

Soo much better than my teacher in school, she never explains anything properly, unlike you.

[@yoonbumi4235]

My mind has made the decision to shut down when it hears anything about numbers adding subtracting multiplying or dividing

[@gleczee8394]

Why does my brain stop functioning when I heard the word function

[@QRSC-fh2ob]

I cannot thank you enough for these videos. They are extremely helpful to me. I need all the help I can get :D

[@R3verse301]

Thanks so much from 12 years after the release of this video.

[@goo_2gle]

Thank you, Domain and range give me so much trouble in pre-cal. Video has given me a good understanding.

[@nataliaesquivel6474]

I spaced out most of my class so Kahn Academy don’t let me down :,) I’ll update and see if this helped me Edit: IT DID I MAKE A PRETTY GOOD GRADE ON MY TEST

[@khurshidafirdaush4574]

Thanks sir for explaining this topic . You helped me a lot . I never saw teacher like you .

[@vancech]

“Functions are often disappointing.” “Now, the domain can be whatever I want.”

[@katherinefaderoga5883]

Thank you so much since I just started in the K to 12 curriculum, I have prelims to answer this for I'm not a good mathematician but a great listener. Thx

[@dodobird7274]

Omg thank you so much! Literal life saver 😭❤️

[@butterflydiary3314]

It's so easy to understand ! life is like trying to set up domain and give it's a law to get a range ,thus we can get a different life .

[@tandojongihlati1194]

bro what...

[@brycenyswonger3087]

What is the name of the man who does these lessons? He needs an award.

[@sahibamehry5596]

I am going to get 2 points tomorrow because of this video. Thanks, Khan Academy !!

[@bobur.yusupov]

Very good!!! Good luck to Khan Academy Group

[@blaigneramos2575]

thAnks to this...now I know...this is so easy.yet when our teachr discussed it..it seem to complicated ......BIG BIG THANKSTO THIS!!!!!!

[@withsamm]

khan academy literally always saving my semester!

[@yukikaze6380]

Thanks for this vid, finally someone that can explain it to me clearly enough to stick to my mind.

[@amnaaziz4659]

no one has ever made me understand maths like this before

[@guneshworisamukcham603]

crying cuz i forgot all about this and have to relearn it all 💀🤡

[@fakemlbb8470]

How to solve: Function. Domain. Range 1.y=7-5x. ? ? 2.y=2x² 3.y=squareroot of X 4.y=-x² 5.y=10-3x

[@someoneintheworldiguess8625]

Thanks for the explanation, you're clapped.

[@christianbriones5971]

Thank you for your video😊.It helps a lot😊

[@mihaeladog7187]

Awesome. Thank you . I had this question on the assignment due after march break . Thank you .

[@carsonclark4416]

Academic comeback of the century

[@nafiskhan8801]

Love from Bangladesh 🇧🇩 ❤ sir

[@HonkYeahArson]

Currently having a mental breakdown, but I still got math homework so here i go >:( Really shows just how messed up the school system is...

[@samantasunanda]

Thank you, you make it look so easy.

[@erenthebombjaeger]

I’m in my 3rd year of Uni taking mathematics of natural science and it’s hard because my prof assumes I remember everything from trig and algebra and all but it’s been over 3 years since I’ve taken a class like that so I feel so incredibly behind. I’ve always liked math but I’m struggling a lot rn

[@supercali3787]

thanks for this. this is awesome. I'm starting to enjoy mathematics

[@valkyrierain313]

Watching this to study the day of a pre cal challenge exam. Fingers crossed

[@oblivionpb7952]

Watching this 20 minutes before my unit test

[@kenny_ki]

i can feel my head pulsating

[@gangadharmore3642]

Best explanation! Finally understood!!

[@FadiDako]

Ive got a math test tomorrow thx so much for thd help

[@namthippvannalathh2273]

Thank you, you save me through high school😂

[@karinalevin9485]

my prof decided since carona us math students dont DESERVE ZOOM LECTURES ( even tho my tuition is paying for them) god bless you bro

[@zenyi2223]

OMG This is actually so good

[@Demogooo]

Thank you for this video, I am in Algebra 2, but I don't have a teacher assigned yet soooo... ye thanks! :)

[@bacmoe9280]

Thanx a-lot u are helping me .. thank God 🙏for having good ppl who would love ❤️ to help others for nothing .

[@Astranamic]

These comments are sad lol! For yall, just think like "Aight, gotta plug in some numbers wherever I see an x and BOOM, I get a number out the other side ( the f(x) side)" The graph just shows what's going on with a line instead of numbers... hope I helped a lil🙏

[@Astranamic]

Also like, Domain is ALWAYS x, and Range is always y. If you look at Range, the g in the word is kinda long and lanky, like y. You can also think of the range of a "rocket", going up or down only.

[@nlebigpapa5336]

Am I the only one that loves this guys voice

[@theexplorer7139]

Thank you! I have an exam tomorrow.

[@iftekhar7266]

EXCELLENT LECTURE INDEED!!!

[@anishk9151]

"JAI HIND DOSTON "🇮🇳

[@rodwayworkor9202]

Hi Sal, pretty well with the graph explanation but make it a bit simpler. Find f(x)=y such that the determinant is negative and the number turns imaginary. Since for y=-5, you get 3(x-1)^2 and hence the determinant must be 0 because there are equal roots, any y below -5 would make the discriminant 0 and hence the range is [-5,∞). This is what I was taught in 8th grade.

[@marcusaddis5502]

Anyone who teaches this garbage is not human. Anyone who can solve them is a sorcerer of sorts. This stuff is unrealistic trash

[@samuraidemon5893]

I’m learning this literally right before a test 💀

[@christopherteo4446]

I love your lesson I learn a lot from watching this ☺ but 1 thing that I didn't understand is the range on the last part..

[@m.ehsaan.]

One can also calculate the range by using differentiation... That'll make it easier. But yeah, this falls into algebra, before the calculus. So, great. Btw, thanks a mountain for this video! 🎉

[@ahmedmahmudi1127]

Thanks for saving my grades

[@itzprogamer1014]

Thank you so much It helped. I got a Maths test in an hour and a half. a little scared but you helped Thanks. I am grade 9 btw

[@xgreg3r]

BRO ur a lifesafer

[@snehasruthi5655]

Thank u sir , it was very useful.....🙏🏻

[@zenypie]

I spaced out while watching this

[@adventuresofgaara8936]

Studying for a math test this helped...

[@NazoPureChaos]

1:03 11 years late, but technically speaking, Real numbers ARE Complex numbers, in the form of a + 0i. More accurately, real numbers are any number that does not contain imaginary parts. (And Imaginary numbers would be any complex number in the form of 0 + bi). Which is a little too complicated for anyone who isn't familiar with complex numbers, but I wouldn't have said Real numbers are everything but Complex numbers, since, you know, they are contained in the Complex number group.

[@yasminahmed9168]

Thanks alot its really helpful

[@heyIappreciateit]

this is very helpful, thankyou!

[@hamidullahhassanzada8957]

is there any general way to find the range of all kind of equations without using graphs . I mean finding ranges algebrically.

[@Abby-uc5ih]

well yes but it needs paperwork

[@Candy-mn6rv]

i did understand a little bit on this now. but this isnt what im looking for,. sadly thank you for this video its very helpful

[@FKacademy]

How about my video on domain and range?

[@milkyyouniverse7197]

This is very complicated cause I am learning this in the 8th grade...

[@scrappyandcrafty5093]

I wish he provided more examples. This function is all real numbers because it doesn't contain neither a square root or a division. simple.

[@godofcalamity6240]

Where did you get your -2,-1,0,1?

[@cornyballs]

it's whatever number value you can think of provided that you have the capacity to graph it

[@thatoneduck1331]

He inputted his own x values

[@coffeestudies3694]

he used the table of values.. since the domain is all real numbers.. any real number is possible to substitute the value of x

[@bracechuma885]

You choose any values you want to substitute (x)

[@harikashatdharshanam4711]

Random

[@shm9377]

Thanks 🙏 😊

[@aryankarnwal8516]

2019 squad where you at

[@biancarene2665]

i stand with you

[@crossfadez5521]

thank you teacher.

[@kimiey4006]

wow..thanks you..nice explaination

[@Sigmamale65320]

Thank you so much sir

[@symphony7871]

you can write the range like [-5,+inf) and thank you

[@ranazara3107]

you mean (-5,R)

[@Adyel-YT]

No, Like This (-5, infinity sign)

[@symphony7871]

No, I mean what I said

[@symphony7871]

If the sign greater than and less than have equal, we write it like what I said .

[@sympetrum667]

our Domain and range only has {x|x} or {y|y}, no graphs or table of values, how about that???

[@FKacademy]

You may like to check my video too on intercepts, domain, and range

[@FKacademy]

You may like to check my video too on intercepts, domain, and range

[@Shergill2525]

I💗 MATH

[@makabentacedricivanv.626]

very very helpful thankyou sir :D