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math

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what is the product of (x+4)and (x-5)
j

  • math -

    4x(x - 5) - 5x(x - 4) = -1
    4x*x - 4x*5 - 5x*x - 5x*-4 = -1
    4x^2 - 20x - 5x^2 + 20x = -1
    -x^2 = -1
    x^2 = 1
    x = 1, x = -1

    So the answer is x = 1 or x = -1.

    I hope that helps! :)

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