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Anonymous
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(2x + 3)(x + 1)
(2x - 1)(x + 4)
3x^2 + x + 2x^2 = 5x^2 + x
x4 + 2x3 - 9x2 + 18x = x(x3 + 2x2 - 9x + 18) which I do not think can be factorised further.
Factors are (x + 4)(x - 2) so x = -4 or 2