Question

find the value of (x+y)^2 + (x-y)^2​ pls tell in detail​

Answer 1

Answer:

(X+y)² + (x-y)²

= x² + 2xy + y² + x² -2xy +y²

= 2x² + 2y²

= 2(x²+y²)

For extra information

(X+y)² = x² +2xy +y²

(x-y)² = x² - 2xy +y²

(X+y)² + (x-y)² = 2(x²+y²)

(X+y)² - (x-y)² = 4xy