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Find a pair of integers with a product of -84 and a sum of 5?

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    Eq1: x*y = -84
    Eq2: x+y = 5

    x+y = 5
    y = 5-x

    In Eq1, replace y with 5-x:
    x*(5-x) = -84
    5x-x^2 = -84
    -x^2+5x+84 = 0
    Use Quadratic Formula and get:
    X = -7, and 12.

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