Question

48x square - 243y square

Answer 1

$48 {x}^{2} - 243 {y}^{2} \\ = 3(16 {x}^{2} - 81 {y}^{2}) \\ = 3(( {4x)}^{2} - ( {9y)}^{2}) \\ = 3(4x - 9y)(4x + 9y)$