$$( \sqrt { 7 } - 6 ) ( \sqrt { 3 } - \sqrt { 7 } )$$
$\sqrt{21}+6\sqrt{7}-6\sqrt{3}-7\approx 3.064778716$
$$\sqrt{7}\sqrt{3}-\left(\sqrt{7}\right)^{2}-6\sqrt{3}+6\sqrt{7}$$
$$\sqrt{21}-\left(\sqrt{7}\right)^{2}-6\sqrt{3}+6\sqrt{7}$$
$$\sqrt{21}-7-6\sqrt{3}+6\sqrt{7}$$
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