x^3-6x^2+11x-6=(x-1)(x^2-5x+6)=(x-1)(x-2)(x-3)
(x^3+6x^2+11x+6)=(x^3+3x^2)+(3x^2+11x+6)=x^2(x+3)+(x+3)(3x+2)=(x+3)(x^2+3x+2)=(x+3)(x+2)(x+1)
