Question

qual o valor da expressao (7a+3b)² ?

Answer 1

(7a+3b)²= 49a²+42ab + 9b²
 Resposta
49a²+42ab+9b²

Answer 2

$\[\\(7a+3b)^2 \\7a^2+2.7a.3b+3b^2 \\\\\boxed{49a^2+42ab+9b^2}\]$