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Math Help - Algebra 2 help: Going from standard form to vertex form?

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

    Quote Originally Posted by wakefuldoze View Post
    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.
    Thanks from wakefuldoze
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    Question 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??
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  4. #4
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    Re: Algebra 2 help: Going from standard form to vertex form?

    Quote Originally Posted by wakefuldoze View Post
    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
    ...
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  5. #5
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    Re: Algebra 2 help: Going from standard form to vertex form?

    Oh I think I got it! Is it c?
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  6. #6
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    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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