Question

Factorise 4xsquare-5ysquare​

Answer 1

$\: \: \: \: \: \: \: \: 4 {x}^{2} - 5 {x}^{2} \\ \\ = > (4 - 5) {x}^{2} \\ \\ = > ( - 1) {x}^{2} \\ \\ = > - 1 {x}^{2} \\ \\ = > \green{\boxed{ - {x}^{2} }}$