Question

(x-y)^2+(x+y)^
try it

Answer 1

(x-y)²+(X+y)²=
(X+y)(x-y)+x²+y²+2xy

Answer 2

$x { }^{2} - 2xy + y {}^{2} + x {}^{2} + 2xy + y {}^{2} \\ = x {}^{2} + x {}^{2} - 2xy + 2xy + y {}^{2} + y {}^{2} \\ = 2x {}^{2} + 2y {}^{2}$