因式分解x四次方+3x三次方-3x平方-11x-6

问题描述:

因式分解x四次方+3x三次方-3x平方-11x-6

x^4+3x^3-3x^2-11x-6
=x^3(x+3)-3x(x+3)-2(x+3)
=(x^3-3x-2)(x+3)
=(x+1)(x^2-x-2)(x+3)
=(x+1)(x+1)(x-2)(x+3)
=(x+1)^2 (x-2)(x+3)