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10 December, 17:38

7 times a number is 18 less than the square of that number. find the positive solution. answer

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  1. 10 December, 20:11
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    N = number

    7n = 18 - n^2

    n^2 + 7n - 18 = 0

    (n-2) (n+9) = 0

    n = 2 and - 9

    answer is 2
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