Question

find the value of ( x + y) ² + ( x-y) ²​

Answer 1

Answer:

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

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

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

=2[(x) ^2+(y) ^2]