math

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how do you factor X^3+X^2-9X-9
pls help. I don't know what to do

  • math -

    looks like grouping might be the simplest way ...

    X^3+X^2-9X-9
    = x^2(x+1) - 9(x+1)
    = (x+1)(x^2-9) and now I see a difference of squares
    = (x+1)(x+1)(x-1)
    or
    = (x-1)(x+1)^2

  • math -

    or, noting the "9" :-)
    (x-1)(x-3)(x+3)

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