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10 June, 21:51

What is the completely factored form of x3 + 4x2 - 9x - 36?

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  1. 10 June, 22:45
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    x^3 + 4x^2 - 9x - 36

    = (x^3 - 9x) + (4x^2 - 36)

    = x (x^2 - 9) + 4 (x^2 - 9)

    = (x + 4) (x^2 - 9)

    = (x + 4) (x - 3) (x + 3)

    Done!
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