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## Answers

That is the formula of x

__2+y2= (x+y)(x+y)__= (x + y)^2 - 2xy

x^2 + y^2 = x^2 - 2xy + y^2 + 2xy

= (x - y)^2 + 2xy

∴ (i) x^2 + y^2 = (x + y)^2 - 2xy.

(ii) x^2 + y^2 = (x - y)^2 + 2xy.

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That is the formula of x2+y2= (x+y)(x+y)

= (x + y)^2 - 2xy

x^2 + y^2 = x^2 - 2xy + y^2 + 2xy

= (x - y)^2 + 2xy

∴ (i) x^2 + y^2 = (x + y)^2 - 2xy.

(ii) x^2 + y^2 = (x - y)^2 + 2xy.