# Thread: Algebra 2 help: Going from standard form to vertex form?

1. ## Algebra 2 help: Going from standard form to vertex form?

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

2. ## Re: Algebra 2 help: Going from standard form to vertex form? Originally Posted by wakefuldoze 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?
complete the square of the given quadratic function ... or expand the given choices and combine like terms.

3. ## Re: Algebra 2 help: Going from standard form to vertex form?

I did that but still got the wrong answer? Where am I going wrong?

I did this:

y = x2 - 2x + 8

(-2/2)2 = (-1)2 = 1

= (x2- 2x + 1) + 8 + 1

= (x-1)2 + 9

What did I do wrong??

4. ## Re: Algebra 2 help: Going from standard form to vertex form? Originally Posted by wakefuldoze I did that but still got the wrong answer? Where am I going wrong?

I did this:

y = x2 - 2x + 8

y = (x2- 2x + 1) + 8 - 1
...

5. ## Re: Algebra 2 help: Going from standard form to vertex form?

Oh I think I got it! Is it c?

6. ## Re: Algebra 2 help: Going from standard form to vertex form?

Well I am just going to go with that. Thanks for all your help.

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