2 (х+2)(х-у)-(х+у)^2

Question

2 (х+2)(х-у)-(х+у)^2

Answer 1

2(х^2-ху+2х-2у)-х^2-2ху-у^2= 2х^2-2ху+4х-4у-х^2-2ху-у^2= х^2-4ху+4х-4у-у^2

Answer 2

2X^2-2xy+4x-4y-x^2-2xy-y^2=x^2-y^2-4xy+4x-4y