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15 April, 00:49

What are two numbers that multiply to 8 and add up to - 9

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  1. 15 April, 01:20
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    Step-by-step explanation:

    xy = 8

    x + y = - 9

    Solve with substitution.

    y = - x - 9

    x (-x - 9) = 8

    -x² - 9x = 8

    0 = x² + 9x + 8

    0 = (x + 1) (x + 8)

    x = - 1 or - 8

    y = - 8 or - 1

    The two numbers are - 1 and - 8.
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