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Expansion of (a ± b ± c)²

Factorize x...

Question

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

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Solution

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

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