Question

(3x +4y) (3x-4y)+ (2x+7y) (x-y)​

Answer 1

$(3x +4y) (3x-4y)+ (2x+7y) (x-y)$

$(9 {x}^{2} - 16 {y}^{2} ) + (2 {x}^{2} + 5xy - 7 {y}^{2} )$

$9 {x}^{2} - 16 {y}^{2} + 2 {x}^{2} + 5xy - 7 {y}^{2}$

$11 {x}^{2} + 5xy - 23 {y}^{2}$