有x的三次方的怎么去因式分解？比如x的三次方+2x的平方-5x-6

Question

如题所述

Answer 1

x³不用分解，已经是最简的了。
x³+2x²-5x-6
=x³+x²+(x²-5x-6)
=x²(x+1)+(x+1)(x-6)
=(x+1)(x²+x-6)
=(x+1)(x+3)(x-2)

Answer 2

x³+2x²-5x-6
=x³+x²+x²+x-6x-6
=x²(x+1)+x(x+1)-6(x+1)
=(x+1)(x²+x-6)
=(x+1)(x-2)(x+3)本回答被提问者采纳