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college algebra

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if (a,-20) is a point on the graph of y=x^2+9x, what is a?

  • college algebra - ,

    solve for x:

    -20 = x^2 + 9x
    x^2+9x+20 = 0
    (x+5)(x+4) = 0

    so, a = -4 or -5

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