(x-x2) (x2 + X-6) (x2 + 3x) (x2-3x + 2)

(x-x2) (x2 + X-6) (x2 + 3x) (x2-3x + 2)


=x(x+3)(x-2)(x-1)/x(1-x)(x+3)(x-2)
=-1