Question

Factories : 20 x² - 45 y²​

Answer 1

$20 x² - 45 y²$

$5(4 {x}^{2} - 9x {}^{2} )$

Using

$a {}^{2} - b {}^{2} = (a + b) \times (a - b)$

$5(2x - 3y) \times (2x + 3y)$

So solution is 5 ( 2x -3y ) × ( 2x + 3y )