Hey,

I'm having trouble figuring out this one problem and I need a little help.

The question is:

What is the vertex form of the equation?

y = x^2 - 2x + 8

the choices are:

a. y = (x+1)^2 + 7

b. y = (x+1)^2 - 7

c. y = (x-1)^2 + 7

How do you figure this out?

Thanks in advance,

Brooke