(2x+y)2

To find the square of (2x + y), we need to expand the expression using the distributive property:

(2x + y)² = (2x + y)(2x + y) = 2x(2x) + 2x(y) + y(2x) + y(y) = 4x² + 2xy + 2xy + y² = 4x² + 4xy + y²

Therefore, (2x + y)² expands to 4x² + 4xy + y².