Simplify: x2+2xy+y2\sqrt{x^2 + 2xy + y^2}x2+2xy+y2 for x+y≥0x + y \geq 0x+y≥0.
x+yx + yx+y
x−yx - yx−y
∣x+y∣|x + y|∣x+y∣
x2+y2x^2 + y^2x2+y2