Answer
$x-5x^2-6x^3=-x(6x-1)(x+1)$
Work Step by Step
$x-5x^2-6x^3=-x(6x^2+5x-1)=-x(6x^2+6x-x-1)=-x[6x(x+1)-1(x+1)]=-x(6x-1)(x+1)$
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