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11 September, 14:46

What adds up to - 2 and multiplies to - 80

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  1. 11 September, 14:54
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    X + y = - 2

    xy = - 80

    x (-2 - x) = - 80

    x^2 + 2x - 80 = 0

    (x + 10) (x - 8) = 0

    Solutions:

    x = 8, y = - 10

    x = - 10, y = 8
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