Упростите выражение 2(х-у)-2(х+у) -4(х-у)(х+у)

2 (x - y) - 2 (x + y) - 4 (x - y)(x + y) = 
1) 2 (x - y) = 2 (x - 2xy + y) = 2x - 4xy + 2y
2) 2 (x + y) = 2 (x + 2xy + y) = 2x + 4xy + 2y
3) 4 (x - y)(x + y) = 4 (x - y) = 4x - 4y
4) 2x - 4xy + 2y - 2x - 4xy - 2y - 4x + 4y = -4x + 4y - 8xy = 4y - 8xy - 4x = y - 2xy - x

Ответ: y - 2xy - x