Question

b) (3ab - 4). (3ab +4) *

9a²b² - 16

3ab + ab + 9

3a²b² -24ab +16

16a²b² -9​

Answer 1

$(3ab - 4) \times (3ab + 4) = \\ \\ (3ab) {}^{2} { - 4 {}^{2} }^{} \\ \\ 9 {a}^{2} {b}^{2} - 16$