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Thread: Complete the square on:

  1. #1
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    Complete the square on:

    Complete the square on:
    x^2 - 8x
    and
    x^2 + 4k

    Thanks
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  2. #2
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    Quote Originally Posted by icesta1 View Post
    Complete the square on:
    x^2 - 8x
    and
    x^2 + 4k

    Thanks
    You have to add and subtract the square of half of your coefficient of $\displaystyle x$.


    So $\displaystyle x^2 - 8x = x^2 - 8x + (-4)^2 - (-4)^2$

    $\displaystyle = \left(x - 4\right)^2 - 16$.



    $\displaystyle x^2 + 4k$ is already complete as the coefficient of $\displaystyle x$ is $\displaystyle 0$.
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