Question

) (2x + 1).(2x - 1) *

10 pontos

4x² -1

2x² -1

4x² + 8x +1

4x² + 1

b) (3ab - 4). (3ab +4) *

10 pontos

16a²b² -9

3ab + ab + 9

3a²b² -24ab +16

9a²b² - 16

​

Answer 1

$a)(2x + 1) \times (2x - 1) = \\ (2x) {}^{2} - {1}^{2} \\ 4x {}^{2} - 1$

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