$$\sqrt { 7 ( 3 \sqrt { 21 } ) ^ { 2 } }$$
$21\sqrt{3}\approx 36.373066959$
$$\sqrt{7\times 3^{2}\left(\sqrt{21}\right)^{2}}$$
$$\sqrt{7\times 9\left(\sqrt{21}\right)^{2}}$$
$$\sqrt{7\times 9\times 21}$$
$$\sqrt{7\times 189}$$
$$\sqrt{1323}$$
$$21\sqrt{3}$$
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