Уростите выражение 4x(x+y)-(x-y)(2x-y)

Question

Уростите выражение 4x(x+y)-(x-y)(2x-y)

Answer 1

4x(x+y)-(x-y)(2x-y)= =4x²+4xy-2x²+2xy+xy-y²= =2x²+7xy-y²

Answer 2

4x(x+y)-(x-y)(2x-y)=
4x^2+4xy-2x^2+xy+2xy-y^2=2x^2-y^2+7xy