Question

factorise the following expressions : 4b^2 - 16b - 9

Answer 1

Hey friend, Here is your answer-

Answer 2

$4 {b}^{2} - 16b - 9 \\ \\ = > 4 {b}^{2} + 2b - 18b - 9 \\ \\ = > 2b(2b + 1) - 9(2b + 1) \\ \\ = > (2b + 1)(2b - 9)$