$$( \sqrt{ 11 } - \sqrt{ 6 } )( \sqrt{ 11 } + \sqrt{ 6 } )$$
$5$
$$\left(\sqrt{11}\right)^{2}-\left(\sqrt{6}\right)^{2}$$
$$11-\left(\sqrt{6}\right)^{2}$$
$$11-6$$
$$5$$
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