=(x^2-x)-8(x^2-x)+12
=(x^2-x-6)(x^2-x-2)
=(x-3)(x+2)(x-2)(x+1)
(x^2-x)(x^2-x-8)+12
=(x^2 -x)^2 - 8(x^2-x) +12
=(x^2-x)^2 - (2+6) +(-2)*(-6)
=(x^2-x-2)*(x^2-x-6)
=(x+1)(x-2)(x+2)(x-3)
解:原式=﹙x²-x﹚²-8﹙x²-x﹚+12
=﹙x²-x-2﹚﹙x²-x-6﹚
=﹙x+1﹚﹙x-2﹚﹙x+2﹚﹙x-3﹚