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15 September, 04:16

Answer this question (x - 2) (x + 5) = 18

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  1. 15 September, 04:30
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    x=-7 x=4

    Step-by-step explanation:

    (x - 2) (x + 5) = 18

    Foil

    x^2 + 5x-2x-10 = 18

    Combine like terms

    x^2 + 3x - 10 = 18

    Subtract 18 from each side

    x^2 + 3x - 28 = 0

    Factor

    What two numbers multiply to - 28 and add to 3: 7 and - 4

    (x+7) (x-4) = 0

    Using the zero product property

    x+7=0 x-4 = 0

    x=-7 x=4
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