Question

can someone help me how to factorise this sum
5x^2-4xy-12y^2 ??

Answer 1

$5 {x}^{2} - 4xy - 12 {y}^{2} \\ = 5 {x}^{2} - 10xy + 6xy - 12 {y}^{2} \\ = 5x(x - 2y) + 6y(x - 2y) \\ = (5x + 6y)(x - 2y)$