(x+1)(x+2)+4(x+1)²-4x(x+1)
Scoateti factorul comun


Răspuns :

(x+1)(x+2)+4(x+1)²-4x(x+1)=(x+1)[x+2+4(x+1)-4x]=(x+1)(x+2+4x+4-4x)=(x+1)(x+6)