$$\frac { 7 \sqrt { 3 } } { \sqrt { 10 } - \sqrt { 3 } } \times \frac { \sqrt { 10 } + 3 } { \sqrt { 10 } + 3 }$$
$\sqrt{30}+3\approx 8.477225575$
$$\frac{7\sqrt{3}}{\sqrt{10}-\sqrt{3}}\times 1$$
$$\frac{7\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)}{\left(\sqrt{10}-\sqrt{3}\right)\left(\sqrt{10}+\sqrt{3}\right)}\times 1$$
$$\frac{7\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)}{\left(\sqrt{10}\right)^{2}-\left(\sqrt{3}\right)^{2}}\times 1$$
$$\frac{7\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)}{10-3}\times 1$$
$$\frac{7\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)}{7}\times 1$$
$$\frac{7\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)}{7}$$
$$\sqrt{3}\left(\sqrt{10}+\sqrt{3}\right)$$
$$\sqrt{3}\sqrt{10}+\left(\sqrt{3}\right)^{2}$$
$$\sqrt{30}+\left(\sqrt{3}\right)^{2}$$
$$\sqrt{30}+3$$
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