Add the following:
$l^{2} + r n^{2}, m^{2} + n^{2}, n^{2} + l^{2}, 2 l m + 2 m n + 2 n l$

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Solution

$l^{2} + r n^{2}, m^{2} + n^{2}, n^{2} + l^{2}, 2 l m + 2 m n + 2 n l$
$= l^{2} + r n^{2} + m^{2} + n^{2} + n^{2} + l^{2} + 2 l m + 2 m n + 2 n l$
$= l^{2} + l^{2} + m^{2} + m^{2} + n^{2} + n^{2} + 2 l m + 2 m n + 2 n l$
$= 2 l^{2} + 2 m^{2} + 2 n^{2} + 2 l m + 2 m n + 2 n l$

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