Question

x的三次方减x的二次方减x减2,

Answer 1

x^3-x^2-x-2

==X^3-2X^2+X^2-X-2

=X^2(X-2)+(X^2-X-2)

=X^2(X-2)+(X-2)(X+1)

=(X^2+X+1)(X-2)