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

(x+1)(x+2)(x+3)=(x²+2x+x+2)(x+3)=X³+2x²+6x+x²+3x+2x+6

(x+1)(x+2)(x+3)=(x²+2x+x+2)(x+3)=x³+3x²+2x²+6x+x²+3x+2x+6=x³+6x²+11x+6

(x+1)(x+2)(x+3) = (x²+2x+x+2)(x+3)= x³+3x²+2x²+6x+x²+3x+2x+6=x³+6x²+11x+6