如何将x^3-11x^2+31x-21因式分解

2025-03-01 06:54:14
推荐回答(1个)
回答1:

x^3-11x^2+31x-21
=x^3-X^2-10X^2+31X-21
=X^2(X-1)+(10X-21)(-X+1)
=(X-1)(X^2-10X+21)
=(X-1)(X-3)(X-7)