Question

Solve step by step ( y + x )^2 + ( x^2 - 2xy + y^2)

Answer 1

(y+x)^2=(x+y)^2
so 
(x+y)^2+(x^2-2xy+y^2)
= (x^2+2xy+y^2)+(x^2-2xy+y^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
if u want to simplify it more then it will be written as: 2(x^2+y^2)