Question

simplifique.

(x +  y)²  + x.(x - 2y)​

Answer 1

(x + y)² + x.(x - 2y)

x² + 2 . x . y + y² + x² - 2xy

x² + 2xy + y² + x² - 2xy

x² + x² + y²

2x² + y²