因式分解:x三次方-3x二次方+x+2=?

问题描述:

因式分解:x三次方-3x二次方+x+2=?

=x三次方-2x二次方-x二次方+x+2
=x²(x-2)-(x²-x-2)
=x²(x-2)-(x+1)(x-2)
=(x²-x-1)(x-2)