x的三次方减x的二次方减1因式分解

题目

x的三次方减x的二次方减1因式分解
错了，是x的三次方减x的平方加x减1因式分解

答案

x³-x²+X-1
=x²(x-1)+(x-1)
=(x-1)(x²+1)