a3-2a2-4a+3因式分解
问题描述：
a3-2a2-4a+3因式分解
答
a³-2a²-4a+3
=a³-2a²-3a-a+3
=a(a²-2a-3)-(a-3)
=a(a+1)(a-3)-(a-3)
=(a-3)(a²+a-1)