Question

(x + y) (2x + y) + (x + 2y) (x – y)​

Answer 1

Answer: 3x² + 4xy - y²

Step-by-step explanation:

(x+y) (2x+y) + (x+2y) (x-y)

x(2x+y) + y(2x+y) + x(x-y) + 2y(x-y)

2x² + xy + 2xy + y² + x² - xy + 2xy - 2y²

= 3x² + 4xy - y²