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x3 + 2x2 - 19x - 20 = x3 + x2 + x2 + x - 20x - 20 = x2(x + 1) - x(x + 1) - 20(x + 1)

= (x + 1)(x2 + x - 20) = (x + 1)(x - 4)(x + 5)

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12y ago

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