(x+1)(x+2)(x+3)-3*4*5 = (x+2-1)(x+2)(x+2+1) - (4-1)*4*(4+1)= {(x+2)^2-1}*(x+2) - (4^2-1)*4=(x+2)^3 - (x+2) - (4^3-4)={(x+2)^3-4^3} - (x+2-4)=(x+2-4){(x+2)^2+(x+2)*4+4^2)-(x-2)=(x-2)(x^2+4x+4+4x+8+16)-...