因式分解:m³-2m²-4m+8;x²-2xy+y²-9
问题描述:
因式分解:m³-2m²-4m+8;x²-2xy+y²-9
答
m³-2m²-4m+8
=m²(m-2)-4(m-2)
=(m-2)(m²-4)
=(m+2)(m-2)²
x²-2xy+y²-9
=(x-y)²-3²
=(x-y+3)(x-y-3)