Question

Efectuar (a+b) al cuadrado - (a+b)(a-b) - [a (2b - 2) - ( -b al cuadrado - 2a) ]

Answer 1

($(a+b)^{2} -(a+b)(a-b)-[a(2b-2)-(- b^{2} -2a)] \\ =a^{2} +2ab+b^{2}-( a^{2} -b^{2} )-[2ab-2a+b^{2}+2a] \\= a^{2}+2ab+b^{2}-a^{2}+b^{2}-2ab+2a-b^{2}-2a \\ =2b^{2}$