college algebra

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Need help finding the x-intercepts
I know that the answer is (10,0),(-10,0),(-1,0) I don't understand how to get (-10,0) and (10,0)

  • college algebra -

    if you rearrange things a bit, you see

    x^3-100x + x^2-100
    = x(x^2-100) + 1(x^2-100)
    = (x+1)(x^2-100)
    = (x+1)(x-10)(x+10)

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