Question

Factorise 4a^2x^2 - 25b^2y^2

Answer 1

$4 {a}^{2} {x}^{2} - 25 {b}^{2} {y}^{2} \\ {(2ax)}^{2} - {(5by)}^{2} \\ (2ax + 5by)(2ax - 5by)$