a^3-3a+2=a^3-a-2a+2=a(a-1)(a+1)-2(a-1)=(a+1)(a-1)(a-2)(x+1)(x+2)(x+3)(x+4)-120 =(x+1)(x+4)*(x+2)(x+3)-120=(x^2+5x+4)(x^2+5x+6)-120=(x^2+5x+5+1)(x^2+5x+5-1)-120=(x^2+5x+5)^2-1-120=(x^2+5x+5)-121=(x^2+5...