Answer:
x⁴+2x²y+y²
Explanation:
Given the equation( x²+y)², to expand, we will open the bracket by multiplyimg the function x²+y by itself to have;
(x²+y)² = (x²+y)(x²+y)
(x²+y)² = x⁴+x²y+x²y+y²
(x²+y)² = x⁴+2x²y+y²
Therefore the expansion form of (x²+y)² is x⁴+2x²y+y²