$$(3\sqrt{5})^{2}-2.3\sqrt{5}.4\sqrt{3}+(4\sqrt{3})^{2}$$
$-\frac{23\sqrt{15}}{25}+93\approx 89.436855321$
$$3^{2}\left(\sqrt{5}\right)^{2}-0.4\times 2.3\sqrt{5}\sqrt{3}+\left(4\sqrt{3}\right)^{2}$$
$$9\left(\sqrt{5}\right)^{2}-0.4\times 2.3\sqrt{5}\sqrt{3}+\left(4\sqrt{3}\right)^{2}$$
$$9\times 5-0.4\times 2.3\sqrt{5}\sqrt{3}+\left(4\sqrt{3}\right)^{2}$$
$$45-0.4\times 2.3\sqrt{5}\sqrt{3}+\left(4\sqrt{3}\right)^{2}$$
$$45-0.92\sqrt{5}\sqrt{3}+\left(4\sqrt{3}\right)^{2}$$
$$45-0.92\sqrt{15}+\left(4\sqrt{3}\right)^{2}$$
$$45-0.92\sqrt{15}+4^{2}\left(\sqrt{3}\right)^{2}$$
$$45-0.92\sqrt{15}+16\left(\sqrt{3}\right)^{2}$$
$$45-0.92\sqrt{15}+16\times 3$$
$$45-0.92\sqrt{15}+48$$
$$93-0.92\sqrt{15}$$
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