Question

(2x-y)² - 2.(x²+y²) - (x+2)² + 4x.(y+1)=

Answer 1

4x²–4xy+y²–2x²–2y²–x²–4x–4+4xy+4x
4x²–2x²–x²+y²–2y²–4xy+4xy–4x+4x–4
x²–y²–4