(x+3)(x+2)^2-(x+3) = (x+3)[(x+2)^2 - 1] = (x+3)(x+2-1)(x+2+1)=(x+1)(x+3)^2
iar cel de-al doilea este
(x-4)(2x+1)^2-x+4 = (x-4)(2x+1)^2 - (x-4) = (x-4)(2x+1-1)(2x+1+1)=2x(x-4)(2x+2)=
4x(x-4)(x+1).
--------------------------------------------
Succes la scoala!