#1
So yeah, I'm in Algebra 2 again, I don't know how to solve a quadratic function in vertex form.

The problem I have is y=3(x+4)squared+5

I know the vertex is 4, 5


ehh?
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#2
What do you mean solve? Find the value of x or graph?
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#4
Quote by Ostinattos
Do you guys know theres already a Math/science thread???


=O no, but this is MY homework thread


I guess I have to graph it, btw.
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#5
x=37
y=19
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#6
Isn't homework supposed to, you know, be done by yourself? Isn't it, I don't know, breaking the rules having someone do it for you?
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#7
vertex form is y= a[(x-h)^2]+k the point (h,k) is the vertex so as you wrote your equation, the vertex is (-4,5)

and ya, what do you mean by solve, find roots?
#9
I wish someone would teach me
And we will weave in and out of sanity unnoticed
Swirling in blissfully restless visions of all our bleary progress
Glowing in radiant madness
#10
ill help you, what exactly do you want to know? If you just have to graph it, start at (-4,5) and then plot some points, pick an x, then run it through the equation to get the y that goes with that x. you will have to be careful to pick x's that work though. for instance, (assuming y=f(x))

f(0)=53 might be tough to graph but
f(-4)=5
f(-5)=8 so on, so on
#11
Solve usually means find the zeroes. If you distribute and what not you get. y=3(x^2)+24x+53
That might be wrong but if its right you then can use quadratic formula on it and get yerself some zeroes

EDIT: math sucks just graph it and look for where it crosses the x axis
#12
It's kind of hard to explain over the internet but you would move it left 4, up 5 and shrink it horiz. by a factor of 3.

Edit:
Quote by -=Croatoan=-
Solve usually means find the zeroes. If you distribute and what not you get. y=3(x^2)+24x+53
That might be wrong but if its right you then can use quadratic formula on it and get yerself some zeroes

EDIT: math sucks just graph it and look for where it crosses the x axis


It isn't going to have any zeros.
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Last edited by Spydr at Oct 20, 2008,
#13
school is for tricks.

drop out, sell coke.

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#14
Quote by Spydr
It's kind of hard to explain over the internet but you would move it left 4, up 5 and shrink it horiz. by a factor of 3.

Edit:

It isn't going to have any zeros.

Damn, didnt think that one through. I dont like imaginary numbers. You can still use quadratic formula but the numbers are all screwy... I think.

EDIT: Quad form gets you 24 plus or minus 2i(Square root of 15)/6
It looks really confusing if you don't write it out.
Last edited by -=Croatoan=- at Oct 20, 2008,
#15
ya you can tell there will be no real roots b/c the vertex is at 5 and it opens up