Solve: $(x + y)^{2} + (x - y)^{2}$

2 x^{2}

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2 x^{2} + 2 y^{2}

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2 y^{2}

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Solution

The correct option is C $2 x^{2} + 2 y^{2}$
$(x + y)^{2} + (x - y)^{2} = x^{2} + y^{2} + 2 x y + x^{2} + y^{2} - 2 x y$

$= 2 x^{2} + 2 y^{2}$

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