Question

desenvolva o produto notável : (9×-3).(9×+3)=

Answer 1

$\LARGE\tt{}(9x - 3) \times (9x + 3) \\ \LARGE\tt{}(9x)^{2} - {3}^{2} \\ \LARGE\tt{}81 {x}^{2} - {3}^{2} \\ \LARGE\tt{} {81x}^{2} - 9 \\ {\large\boxed{\boxed{  { \LARGE \tt {81x}^{2} - 9 }}}}$

${\large\boxed{\boxed{  { \large \tt Bons~Estudos! }}}}$