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How do I factor 9x to the 3rd power + 36xsquared - x - 4 completely? Please help...?

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thanks in advance...

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  1. use grouping .. . .

    9x^3 + 36x^2 - x - 4

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

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

    (9x^2 - 1) (x + 4) .. . .. . here , use difference of two squares on first

    (3x - 1) (3x + 1) (x + 4)

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