$$( 4 \sqrt { 5 } - 5 \sqrt { 3 } ) ^ { 2 }$$
$155-40\sqrt{15}\approx 0.080666152$
$$16\left(\sqrt{5}\right)^{2}-40\sqrt{5}\sqrt{3}+25\left(\sqrt{3}\right)^{2}$$
$$16\times 5-40\sqrt{5}\sqrt{3}+25\left(\sqrt{3}\right)^{2}$$
$$80-40\sqrt{5}\sqrt{3}+25\left(\sqrt{3}\right)^{2}$$
$$80-40\sqrt{15}+25\left(\sqrt{3}\right)^{2}$$
$$80-40\sqrt{15}+25\times 3$$
$$80-40\sqrt{15}+75$$
$$155-40\sqrt{15}$$
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$155-40\sqrt{15}$
