$$\frac{ 15-2 \sqrt{ 5 } }{ \sqrt{ 5 } }$$
$3\sqrt{5}-2\approx 4.708203932$
$$\frac{\left(15-2\sqrt{5}\right)\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$\frac{\left(15-2\sqrt{5}\right)\sqrt{5}}{5}$$
$$\frac{15\sqrt{5}-2\left(\sqrt{5}\right)^{2}}{5}$$
$$\frac{15\sqrt{5}-2\times 5}{5}$$
$$\frac{15\sqrt{5}-10}{5}$$
$$3\sqrt{5}-2$$
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