Question

(x-y)square-(x+y)square

Answer 1

xsquare-2xy-ysquare.

Answer 2

(x-y)²-(x+y)²
(x-y+x+y)(x-y-(x+y))
using a²-b²= (a-b)(a+b)
2x(x-y-x-y)
2x(-2y) = -4xy
hope this helps