$$-5 \sqrt{ \frac{ 2 }{ 5 } }$$
$-\sqrt{10}\approx -3.16227766$
$$-5\times \frac{\sqrt{2}}{\sqrt{5}}$$
$$-5\times \frac{\sqrt{2}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$-5\times \frac{\sqrt{2}\sqrt{5}}{5}$$
$$-5\times \frac{\sqrt{10}}{5}$$
$$-\sqrt{10}$$
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