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18 April, 20:01

What value added to x2 - 8x would complete the square?

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  1. 18 April, 20:09
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    X^2 - 8x = (x - 4) ^2 - 16

    we add 16 to give x^2 - 8x + 16 which is a perfect square

    x^2 - 8x + 16 = (x - 4) ^2

    answer is 16
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