Question

因式分解:x的3次方+2X的平方-5X-6怎么做

Answer 1

x^3+2x^2-5x-6

=x^3+(x^2+x^2)-5x-6

=(x^3+x^2)+(x^2-5x-6)

=x^2(x+1)+(x+1)(x-6)

=(x+1)(x^2+x-6)

=(x+1)(x-2)(x+3)