$${ \left(2 \sqrt{ 7 } +3 \right) }^{ 2 }$$
$12\sqrt{7}+37\approx 68.749015733$
$$4\left(\sqrt{7}\right)^{2}+12\sqrt{7}+9$$
$$4\times 7+12\sqrt{7}+9$$
$$28+12\sqrt{7}+9$$
$$37+12\sqrt{7}$$
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$12 \sqrt{7} + 37 = 68.749015733$
