X的三次方-6x的二次方+11x-6

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X的三次方-6x的二次方+11x-6

X^3-6X^2+11X-6
=(X^3-6X^2+9X)+(2X-6)
=X(X^2-6X+9)+2(X-3)
=X(X-3)^2+2(X-3)
=(x-3)(X^2-3X+2)
=(X-3)(X-2)(X-1)

(x-1)(x-2)(x-3)