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(x + 4)(x + 1)
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x2-5x+4 = (x-1)(x-4) when factored
(x - 4)(x - 1)
x2 + 5x - 120 can not be factored.
(x-1)(x-4)
x3 - 4x2 + 5x - 20 = x2*(x - 4) + 5*(x - 4) = (x2 + 5)*(x - 4)