Algebra Help: Finding the Equation of a Parabola

[Jmacd24]

How can people say they've never learned this? My Alg2/Trig teacher told me that this is the most important thing we'll ever learn, and that it'll never go away in our math lives.

[christianisjewish]

there are probably 2 types of ppl watching these videos

1. people who need help with homework

2. math genius's finding something to correct

[RTRVII]

The video in one line: ax^2+bx+x=0 which is three unknowns so you need three conditions and these are your points through which it goes.

[mrsammie112091]

is this stuff from linear algebra? I just took college alg2 and now i'm in precal and we never learned this. should I have known this from alg2?? crap

[joshua1marcelo]

Thanks man!

[stencells]

Thank-you sir!

[kheder91]

the best who's

agree?!!?

[LittleNinjaJazz]

now what if only the vertex and one coordinate is given?

[wplong2]

@LittleNinjaJazz Then you should use the vertex form y=a(x-h)^2 +k (h,k) are the coordinates of the vertex then substitute the other coordinate or point in for x and y and then solve for a. Once you have done that then you should rewrite it in the form y= (use the value you found for a)(x- (the x value of the vertex))^2 + (the y value from the vertex. If you need to you can expand the (x-h)^2 and combine like terms after multiplying by the a.

[Abprat1]

5 people hate old men

[02915a]

my teacher spent about week on this and she was doing differently no one understood it, but 5 minutes of watching this video and I got it.

[KokoTalula]

what did you add the two equations at 3:34?

[needsomekyle]

opps i blinked now i have to restart...

[eppiii94]

nice discussion

[anarchist4freedom]

I have a maths exam tomorrow, hopefully this helps. Math is the only subject I just struggle to understand...I seem to understand it better though once I research it online rather than studying it at school. Thanks!

[crabbinsOhCrabbins]

such a champ

[andreww1212]

This guy is the man. He helped me get through a lot of math in college. I have successfully completed College Algebra/Geometry, Pre-Calculus, Calculus I, Calculus II, Calculus III, Diff. Eq., Linear Algebra and Euclidean Geometry. Scored my minor in mathematics on top of a major in Engineering Science!

[OldSchoolRap21081]

now lets all hope i dont fail my test tomorrow.

[kize127]

MY FUCKING TEACHER DIDN'T TEACH THIS SHIT.

[green101pit]

@kize127 same here!!

[kize127]

@green101pit no lgeit. my dad is a university mathematics teacher so naturally i have a 97 but this did not come into the test!

[Kiwikoool]

My hero <3

[thisburittoisfilling]

so this is what the Architect of the matrix does in his free time

[adventure4lifeRDH]

I GET IT! you rock dude. I failed algebra 2 twice in high school and now that I'm graduated I'm back to get my revenge and you've been a big help. thanks.

[MsRakkatakka]

@adventure4lifeRDH You failed algebra 2 twice? Yeah.

[UberDorkAndProud]

Thankyou boss man :)

[peterelliotpeter]

good teaching

[yenned2]

let me just say after HOURS of trying to get good explanations and examples online to solve a parabola problem I have in my college algebra class......YOU are the only one who helped me GET IT!

thank you for explaining this so clearly and simply.

[AgentCC9]

If you guys are flipping out because you don't understand this then just go get a tutor. This guy is just trying to help. He's doing a great job

[AgentCC9]

If you guys are flipping out because you don't understand this then just go get a tutor. This guy is just trying to help.

[GIRLS4REAL1]

I DONT UNDERSTAND WHAT DAT MAN SAY

I THOUGHT I WAS JUST SLEEPY

[lubbzy123]

i dont get it man ihave a test about this tomorrow

[XsoEmiXD]

Waaa, I feel dumb -.- I'm in eighth grade and can't get this.

[gracian123]

thanks alot! without this vid i wouldve never been able to complete my alg.2 project.

[incredible3010]

YOU RUINED MY LIFE YOU PARABOLIC ASSHOLE

[incredible3010]

@incredible3010 that is so true! mathematits never shut up...fucking god ur right. str8 up

[JKTCGMV13]

If anyone knows anything about D&D, I'm using this to find the equation of the exp.

[Kikidee202]

Thank you SO much for this! I'm in geometry now and I needed to find a formula for a problem about dividing a circle, and I completely forgot everything I learned about parabolas in algebra last year (I'm not sure that I even ever learned this). This is a lifesaver!

[StickmanWillA1]

wow... this was really good. now i learned how to use parabolas with algebra overnight. (literally) Its probbaly another 3-4 years before i learn that in school

[JedmNZ]

There really is an easier way. Look for the two x-intercepts of the parabola. My two are (-3,0) and (2,0). Using this formula, y=(x+a)(x+b), substitute each of the x intercepts into the equation (-3 would be a, 2 would be b, leave the 'x's alone), and change the signs around.

So the final outcome for me was y=(x+3)(x-2)

SIMPLE! Thumbs up so others can see.

[lazer1235]

but what happens if the equation in green wasnt "1=c", say it was "1=5a+5b+c"??

[nondolee]

thumbs up if you're asian :D

[Hello99825]

I wish I could pause by pre calc teacher like this. Maybe I would actually learn something.

[101myopinion]

but what if c doesnt = 1? by points are (0.45, 0.225) (1.5,0.45) (3,0)

[madamerotten]

The supposition of multi-angled quantum indices are supplemented by the coefficients of diffraction-grated cheddar cheese and extra-pepperoni momentum parcels. That's why automatic sugar-coating modal theory is deviant under the scrutiny of terrestrial infusion and dating game convolutions. It should be obvious that parabolas are paramount to this supposition.

[JKTCGMV13]

@madamerotten Exactly!

[denewlandjp]

Thank you!

[ImProbablyWeird]

Woah how can people understand this...

[bob123rulz]

I love this guy!!!

[cuban321123]

thank you very much sir i loved your help and i love what you are doing.please continue to make these videos i can come and watch when i dont understand what i was taght in class thank you so much

[iranianboy123]

Why did you multiply the equation by 2?

[tehmadcap]

@iranianboy123 So the -2b and +2b cancel each other out, and leaves only the sum of a.

[bob123rulz]

@iranianboy123

Look at simultaneous equations, thats what he is on about. =D

[deathconceal1]

Woah, for people who are looking for Parabola by Schism equation, the songs are all suposed to be played in a different order. 6,7,5,8,4,9,3,10,2,11,1,12,13 The morph from Parabola into Schism is mindblowing, exactly on point. It truly is amazing.

[UltraMewMewDharley]

thaks owo me entere mejor gracias a esto xD

[karenbee1996]

THANKS! :)

[TheRunescapeDragon2]

Best math teacher I have ever seen. All of the ones I have had in the past suck compared to this one.

[Oliverkina]

I owe you the biggest thanks with your help i have a good chance of getting an A tomorrow !!! :)

[TheBlenderanimations]

purely amazing

[OsamaTheMamaLama]

very good explanation. thank you very much for sharing. =]

[TheKillerKoalas]

Come to Romania!

sorry if there's any incorrect grammar, I'm Romanian

[cwbh10]

great way to visualize it =D

[littlebigsim]

This is such an easy way of explaining it! My teacher just does everything her way, and none of us students understand what she's doing because she mumbles.

[Randomizationable]

Thank you so much i was absent and my teacher had to explain this to me in five minutes but you did a much better job in that time limit.

[thecreepyk1d]

Didn't really help with the problem i am needing help on, but i DO have a better understanding of parabolas now! lol.

[jOWNZin22]

after eight years i just realized where i messed up in high school on this shit. god school is horrible.

[DaCheezPuff]

wow this is a real teacher i learned what was worth 5 classes in my schjool in 5 mins

[saberallen5]

THANK YOU!

my Teacher doesn't show us how to do anything

[nicknkub]

He's a boss!

[deenarine]

nope it's -7... you're probably thinking (-3.5)x(-3.5)=7..in that sense yes..but -3.5x2=-7

[SneakinAbout]

@deenarine Don't you mean (-3.5)*(-2) ? Hehe.

[touvejs]

-3.5x2=-7? no it's seven...

[McMarcko]

my lecturer never taught me such a thing!,he taked of y2=4ax

[MYZZMYLANDRIA]

Thank you so much. This is the exact problem I have for homework

[MYZZMYLANDRIA]

Thank you so much. This is the exact problem I have for homework

[koberulz96]

dude i think you just helped me pass my exam

[LeQuack147]

Holy crap, this is the exact same problem I have in front of me. What are the odds?

[McFreyes]

Thaaaank yoooou.

[Tommyjnr123]

Thank you , this video has help a lot  :)

[Kininet]

Excellent.

[FierceElectric]

This doesnt help because none of my x points are 0.....

[TheKlushkin]

i wish i had this teacher for trig

[SilentStormShadow]

If you only have information for 2 points, can you still do this?

[kiwicaz]

this guy's good

[emersonlimap2]

vídeo muito Bono (de chocolate)!!! gostei ;d

[crazzynez]

you look like you eat bananas

[lucile1010]

thank you!

that's really helpful, but my brain dont work that good during exams DDx

[dudekc88]

@lucile1010

no ok

[11drawer]

This takes a long time but hey it's right :D

[taybaby90]

how do you finf the equation of th parabola with its vertex at the poin of origin and the focal point F(0,2)

[kkkkaaatte]

I'd smile like that if I could do parabolas that easy.

[ChofisxD]

Así es como una empieza a AMAR las matemáticas: Con excelentes profesores.

[chepitocool]

W

T

F

are you doing :'(

[emoTMO]

i still don't get it!!!!

[Pwntzyou]

Very good refresher^^

[Matt6069]

Thanks a ton, it actually helped me!

[nickfelms133]

thank you

[macxhelp]

this is great help. you saved my life. :) thank you so much.

[TheMarwa1993]

fantastic teacher!!! ^.^

[dudeominator]

ill arrange your ticket to australia lets sayyyyy tonight and hopefully youll be here by the end of the week :P

[Hisflock777]

Thank You so much! i was stuck on a problem before I watched your video, awesome teaching skills ^_^

[gmsherry1953]

I have forgotten how to use a matrix to solve a system of equations. I searched your site for "matrix" or "matrices" or "system of equations" and did not find a lesson on that method. Do you have one? (If you have one on Kramer's rule I'd be interested in that, too; never heard of it.)

[robo2000nitro]

dont you just love maths. when you know how to do it everything just falls into place.

[p2kkpilin]

what??...

confusing!! teacher.

[AlexzandrSpringvale]

Prof. you make it look so simple. God bless you and thanks for posting.

[BillieBaby143]

Gosh I've been trying to figure out this same exact problem for a while now and I finally get it thanks to you! Thanks so much!!

[crazyshooter1993]

i loved the way you are tiching, excellant

[naishandb]

@crazyshooter1993 I think you should be watching spelling tutorials, not math.

[sunnyisbunny]

Great Help Thank You!

[shadowcrazer]

wat if c wasnt given that it was 1, how would u solve it?

[gowtime]

@shadowcrazer right i think this was pretty obvious because C was already given

[mopstylez2]

ah peice of cake

[dracolord234]

im confused

[deepikafan1]

This is confusing!!

[chamionandon]

i always utilize y2=4cx sucks

that would be so much harder

[michaelvestante]

parabola formula is : a(x+h)2+k

[myztainzydeout]

This equation is messed up. This is practically explaining all of our creation pattern. The start of it any ways.

[rs2wtf]

thanks you made it sound much easier than the teacher put it :D 5/5

[lvnonTheEdge]

thank you so much you have helped me pass high school

[Textaddict678]

thank lil white haired man! i felt so smart after this! u jus made my homework a lot easier

[97metalhead]

Great job. I am very bad at any kind of math. lol

[rumpl4skin269]

i need to know this for an extra credit bcuz i have a c in honors algebra..looks like im not getting the extra credit..this is impossible..

[drzdiplomat]

there are three set of points because he is finding three different equations.

[jeysan1000]

Im confused

[JimmyKhayata]

why are there 3 sets of points? shouldn't there be x1 and x2 and h and k?

[MrPvallone]

This guy is the best teacher

[joenie071284]

may i comment on the equation used, it should be x = ay^2 + by + c, why? because the parabola is opens to the left or symmetrical to the x axis... i think you should be careful.. i am a math major too.

[sexybeaste]

actually, the dude's right.

his equation works. try plugging it into a calculator.

the parabola here opens down, not to the left.

[LeComaAnim]

Can you please replace Ms Perry? She teaches chick math at Inglemoor and she sucks.

[BOERDRUM]

Sir you should be a school teacher. The students would love you for it.

[michellebritoo]

wow wish you were my math teacher

[rxxxxxxxxxxr]

thank you very much :) very good teacher

[youngcp425]

excellent teacher

[mrsilvermink]

thank u very much!!!!!!

[maths486]

I'd like to comment on your lesson. Can't we possibly have more than one parabolas here? Well, x = ay^2+by+c is certainly also an equation of a parabola, right?  But of course its symmetry axis is parallel to the x-axis. My point is, the problem should be clear of any ambiguities.

[bellatesla]

Very good thank you professor for taking the time to do this I wish you and everyone around you pleasant tidings

[penorpls]

Come to Australia and teach over here! =P

Our teachers are shit....

[riashadbro]

OMg , great work sir, you teach way better then the teacher i have who i pay 30 bucks an hour

[nikobroo]

Thank you so much! ( :

Can you please keep up the good work on math help?

[Nebulae8]

thanks a lot. ^.^

[dutto75man]

my teacher has given me two points (1,2) and (2,4) and told me that its a parabola. He hasn't given me a y intercept coordinate either. How do i do it?

[dunker98765]

thanks alot. this was very helpful

[rousogan]

mathtv rocks!

[QXZASX]

Good work sir. Clear and concise.

[f3z3rz]

wow, thank you soo much, u explain it so clearly

[OoojayAnnooO]

Thanks!

[BubbaGump332]

finite differences

[DUDEMIKE8]

that helped me out so much

[hanssach]

extremely helpful thanks alot

[Yoke921]

Helpful but I do not understand why you multiplied a+b=-3.5 times 2??????

[dexter200161054]

He multiplied it by 2 so that way the b would cancel out.

[kx3clock]

its order of elimination

[jxantona]

fascinating, thanks.

[aZeitgeist]

very useful, thankyou :)

[fatshadow92]

0 = a(0+2)^2 +2

a = -4

and tehn you can do some manipulation to get it into standard form

would that work?

[fatshadow92]

can you assume that (-2,2) is the center? because then you know its going to ba a negative parabola, then you can substitute using vertex form.

y = a[x-(-2)]^2 +2

y = a(x+2)^2 +2

then you can say

y =

[Waranle]

wenjiang1, your mouth is a full of shit. Have some respect punk ass.

[wenjiang1]

i understand what u r trying to say...

but honest i think ur method is bullshit...

[seryts]

Thank you Mr. McKeague

[kriegsmark]

Spot on! A system of 3 equations with 3 unknowns Don't use your TI calculator's to solve this system of equations... just a pencil and scratch paper haha!

[SteadyHaze]

Excellent

[onemuslimvoice]

thanks I love all your vids :) reminds me of high school :)

[Kite207]

OMV? is that you? wow! everywhere I go i find you.

[onemuslimvoice]

well I have a great amount of interests :) cooking, crafts, gardening, mathematics, cartoon watching hahahahaha

[centereddude]

I like turtles