Question

Demonstrati identitatea: $a^3+b^3=(a+b)(a^2-ab+b^2)$

Answer 1

...................................

Answer 2

pai $( a^{2} -ab+ b^{2} ) = (a-b)^{2}$ si daca inmultim obtinem  $a^{3} - a^{2} b +a b^{2} + a^{2} b - a b ^{2} + b^{3}$ iar dupa ce reduci termeni asemenea iti va da $a^{3} + b^{3}$