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Math Help - Parabolas and Vertex

  1. #1
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    Parabolas and Vertex

    So I was working on a study guide and got to a problem I cannot figure out. I won't have time to ask my professor about it before the test so I am just gonna post here.

    f(x)=4x^2-4x+21

    The vertex should be: 1/2 , 20

    I understand the 1/2 part, but I can't get 20 no matter what I do. I am almost positive I am just leaving something out.
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  2. #2
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    Jun 2009
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    I got it now. I was leaving out one simple step
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