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30 October, 19:23

when 21 is subtracted from the square of a number, the result is 4 times the number. find the negative solution

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  1. 30 October, 20:09
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    x = - 3

    Step-by-step explanation:

    x² - 21 = 4x

    x² - 4x - 21 = 0

    (x + 3) (x - 7) = 0

    x = - 3 or x = 7
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