write in vertex form

Algebra
Tutor: None Selected Time limit: 1 Day

May 19th, 2015

Hello! :)

y=2x^2 - 12x + 16

Must 'complete the square', so get x's on right side by themselves by subtracting 16 to left side.

y-16 = 2x^2 - 12x

Factor out the 2 on the right side of equation.

y-16 = 2(x^2-6x)

Now you have to 'complete the square' on the right side of the equation.  When you add the 9 on the right side, be careful adding to the left side, because there is a 2 outside of the parenthesis on the right side.  Now, you add (9*2)=18 onto the left side of the equation.

y-16+18=2(x^2-6x+9)

You have your perfect square, which is (x-3)^2

y+2=2(x-3)^2

Now subtract 2 to the right side of the equation to put it into vertex form.

y=2(x-3)^2-2

Answer is C.

Let me know if you have any questions :).  This can be a rather difficult concept.

May 19th, 2015

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