因式分解m的3次方-2m平方-4m+8=
问题描述：
因式分解m的3次方-2m平方-4m+8=
答
m³-2m²-4m+8
=(m³-2m²)-(4m-8)
=m²(m-2)-4(m-2)
=(m²-4)(m-2)
=(m+2)(m-2)(m-2)
=(m+2)(m-2)²