Упрастите: (x-y)^2+(x+y)^2+2(x-y)(x+y)

Question

Упрастите:
(x-y)^2+(x+y)^2+2(x-y)(x+y)

Answer 1

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

Answer 2

X^2-2xy+y^2+x^2+2xy+y^2+2x^2+2y^2
x^2+y^2+x^2+y^2+2x^2+2y^2
4(x^2+y^2)