Question

Выполните действия. (x+y)^2-(x-y)^2

Answer 1

(x+y-x+y)(x+y+x-y)=2y*2x=4xy

Answer 2

(x+y)z^2-(x-y)^2=x^2+2xy+y^2+x^2-2xy+y^2=2x^2+2y^2