Question

calcule el área de la siguiente figura ​

Answer 1

Explicación paso a paso:

$a = b \times h$

$a = (3 {a}^{2} + 9)(3 {a}^{2} - 9)$

$a = (3 {a}^{2} {)}^{2} - {9}^{2}$

$a = 9 {a}^{4} - {9}^{2}$

$a = 9 {a}^{4} - 81$