Question

what is the formula of x(square) + y(square)?

Answer 1

Heya !
Your answer is in the pic.
Actually it doesn't has a formula but let's derive

Hope you find my answer useful and hope you mark my answer as brainliest !

Answer 2

Answer:

$\frac{(x+y)^2+(x-y)^2}{2}$

Step-by-step explanation:

Since,

$(x+y)^2=x^2+2xy+y^2$ -------(1)

And,

$(x-y)^2=x^2-2xy+y^2$ --------(2),

By adding equation (1) and (2),

We will get,

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

$2(x^2+y^2)=\frac{(x+y)^2+(x-y)^2}{2}$

$\implies x^2+y^2=\frac{(x+y)^2+(x-y)^2}{2}$