Question

(2a+b)²- (a-b)² é igual a :
a=3a²+2b²
b=3a²+6ab
c=4a²b+2ab²
d=4a²+4ab+b²
resposta com calculo

Answer 1

$(2a+b)^{2}- (a-b)^{2}= \\ 4a^{2}+4ab+b^{2}-(a^{2}-2ab+b^{2})= \\ 4a^{2}+4ab+b^{2}-a^{2}+2ab-b^{2}= \\ 3a^{2}+6ab \\ \\ S=[b]$