求分解因式:x^4+2x^3-2x^2-2x+1

问题描述:

求分解因式:x^4+2x^3-2x^2-2x+1

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