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24 February, 09:04

Factor k^2+k-72 ...

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  1. 24 February, 10:10
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    (k + 9) (k - 8)

    Step-by-step explanation:

    Given

    k² + k - 72

    Consider the factors of the constant term ( - 72) which sum to give the coefficient of the k - term ( + 1)

    The factors are + 9 and - 8, since

    9 * - 8 = - 72 and 9 + 8 = + 1, hence

    k² + k - 72 = (k + 9) (k - 8)
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