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Factor completely 2x3 x2 - 18x - 9. (x2 - 9) (2x 1) (x - 3) (x 3) (2x - 1) (x - 3) (x 3) (2x 1) (2x - 3) (2x 3) (x - 1)

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  1. 3 May, 18:26
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    2x^3 + x^2 - 18x - 9 = x^2 (2x + 1) - 9 (2x + 1) = (2x + 1) (x^2 - 9)

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

    Used: a^2 - b^2 = (a - b) (a + b)
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