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12 September, 21:11

Complete the square to write c (x) = x2 - 16x 84 in vertex form.

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  1. 12 September, 22:17
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    Group

    c (x) = (x²-16x) + 84

    take 1/2 of - 16 and square it

    -16/2=-8, (-8) ²=64

    ad negative and positive inside

    c (x) = (x²-16x+64-64) + 84

    factor

    c (x) = ((x-8) ²-64) + 84

    distribute or get rid of paenthsees

    c (x) = (x-8) ²-64+84

    add

    c (x) = (x-8) ²+20
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