Question

factorise the following expression ​

Answer 1

$= 16 {(2x - 1)}^{2} - 25 {y}^{2} \\ = {(4(2x - 1))}^{2} - {(5y)}^{2} \\ = {(8x - 4)}^{2} - {(5y)}^{2} \\ = (8x - 4 + 5y)(8x - 4 - 5y)$