Question

Aratati ca
$E(x)=[(x+2)^3-(x+2)^2]:(x+1)$
Este patrat perfect, oricare x∈R \ {-1}

Answer 1

E(x) = [(x+2)² (x+2-1)]: (x+1) = (x+2)²·(x+1) : (x+1) = (x+2)² = patrat perfect