Question

Use suitable identity to find the following products

(i) (2x+7y)(2x+5y)​

Answer 1

$(2x + 7y)(2x + 5y)$

$= 2x(2x + 5y) + 7y(2x + 5y)$

$= 4 {x}^{2} + 10xy + 14xy + 35 {y}^{2}$

$= 4 {x}^{2} + 24xy + 35 {y}^{2}$

Answer 2

$(2x + 7y)(2x + 5y)$

$= 2x(2x + 5y) + 7y(2x + 5y)$

$= 4 {x}^{2} + 10xy + 14xy + 35 {y}^{2}$

$= 4 {x}^{2} + 24xy + 35 {y}^{2}$