Question
$2 x(z-x-y)$ एवं $2 y(z-y-x)$ को जोड़िए।

Answer

$\begin{aligned} 2 x(z-x-y)+2 y(z-y-x) & =2 x z-2 x^2-2 x y+2 y z-2 y^2-2 x y \\ & =2 x z-2 x y-2 x y+2 y z-2 x^2-2 y^2 \\ & =-2 x^2-2 y^2-4 x y+2 y z+2 z x\end{aligned}$

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