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17 April, 12:28

2 numbers sum is 7 product is - 18

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  1. 17 April, 13:56
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    X+y=7

    x•y=-18

    x+y=7

    x=7-y

    x•y=-18

    (7-y) •y=-18

    7y-y^2=-18

    -y^2+7y+18=0

    Y^2-7y-18=0

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

    y is either 9 or - 2

    x+y=7

    x=7-y

    X=7-9

    X=-2

    X•y=-18

    9• (-2) = - 18

    -18=-18

    There you go, y is 9 and x is - 2
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