Question

(x+3y)×(2x-3y)+(2xy)×(2x+6y)​

Answer 1

$\sf{(x + 3y)(2x - 3y) + (2xy)(2x + 6y) }$

$\sf{= 2 {x}^{2} - 3xy + 6xy - 9 {y}^{2} + 4 {x}^{2} y + 12x {y}^{2}}$

$\sf{\red{= 2 {x}^{2} - 9 {y}^{2} + 4 {x}^{2} y + 12x {y}^{2} + 3xy}}$