$$( \sqrt { 7 } + \sqrt { 5 } ) ^ { 2 }$$
$2\left(\sqrt{35}+6\right)\approx 23.832159566$
$$\left(\sqrt{7}\right)^{2}+2\sqrt{7}\sqrt{5}+\left(\sqrt{5}\right)^{2}$$
$$7+2\sqrt{7}\sqrt{5}+\left(\sqrt{5}\right)^{2}$$
$$7+2\sqrt{35}+\left(\sqrt{5}\right)^{2}$$
$$7+2\sqrt{35}+5$$
$$12+2\sqrt{35}$$
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$2 \sqrt{35} + 12 = 23.832159566$
