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26 September, 02:53

X (7 - x) > 8 A. 8 B. 2 C. - 1 D. 0

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  1. 26 September, 05:28
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    =7x-x^2>8

    0=7x-x^2-8

    0 = - x^2 + 7x - 8

    0 = (x^2 + 8x) - (x - 8)

    0=x (x + 8) - 1 (x + 8)

    0 = (x-1) 0 = (x+8)

    x=1 x = - 8
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