Homework Help: math

Posted by olive on Sunday, July 29, 2007 at 10:21am.

transform the ff. into the form f(x) = a(x - h)2 + k:
f(x)=x2-6x+4
f(x)=x2+4x+2
f(x)=3x2-5x+1

tnx a bunch!!!1

I'll do the third one for you, the first two are really easy

f(x)=3x^2-5x+1
=3(x^2 - 5/3 x ) + 1 factored out the 3 from first 2 terms
=3(x^2 - 5/3 x + 25/36 - 25/36) + 1 took half the coefficient of the x term, squared it, then added and subtracted it
= 3((x-5/6)^2 - 25/36) + 1 changed x^2 - 5/3 x + 25/36 to (x-5/6)^2, that is why it is called "completing the square"
=3(x-5/6)^2 - 25/12 + 1 multiplied by 3
=3(x-5/6)^2 - 13/12

of course a quicker way would be to find the x of the vertex using x=-b/(2a) = 5/(2*3) = 5/6 then subbingh that back into the equation to get y.
y = 3(25/36) - 5(5/6)+1
=25/12 - 25/6 + 1
=(25 - 50 + 12)/12
= -13/12

now form your equation
y = 3(x-5/6)^2 - 13/12

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