x³+2x²-10x-2 用分组分解法因式分解
问题描述:
x³+2x²-10x-2 用分组分解法因式分解
答
x³+2x²-10x-20
=x³-10x+2x²-20
=x(x²-10)+2(x²-10)
=(x²-10)(x+2)