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Math Help - Parabola

  1. #1
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    Post Parabola

    The term that needs to be added to y=x^2+8x to make it a perfect square is?

    a) -8
    b) 4
    c) 8
    d) 16
    e) 64
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by iorga View Post
    The term that needs to be added to y=x^2+8x to make it a perfect square is?

    a) -8
    b) 4
    c) 8
    d) 16
    e) 64
    Im not sure what you call the theorem in English, but it basically involves the following:

     c = (\frac{b}{2})^2

    So c = 16.

     y = x^2+8x + 16

     y = (x + 4)^2
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