x的3次方+3x的2次方-4x-12
问题描述:
x的3次方+3x的2次方-4x-12
答
x的3次方+3x的2次方-4x-12
=x²(x+3)-4(x+3)
=(x+3)(x²-4)
=(x+3)(x²-2²)
=(x+3)(x+2)(x-2)