$$\sqrt{ 5 } ( \sqrt{ 3 } -1)- \sqrt{ 5 } ( \sqrt{ 7 } -1)$$
$\sqrt{15}-\sqrt{35}\approx -2.043096437$
$$\sqrt{5}\sqrt{3}-\sqrt{5}-\sqrt{5}\left(\sqrt{7}-1\right)$$
$$\sqrt{15}-\sqrt{5}-\sqrt{5}\left(\sqrt{7}-1\right)$$
$$\sqrt{15}-\sqrt{5}-\left(\sqrt{5}\sqrt{7}-\sqrt{5}\right)$$
$$\sqrt{15}-\sqrt{5}-\left(\sqrt{35}-\sqrt{5}\right)$$
$$\sqrt{15}-\sqrt{5}-\sqrt{35}-\left(-\sqrt{5}\right)$$
$$\sqrt{15}-\sqrt{5}-\sqrt{35}+\sqrt{5}$$
$$\sqrt{15}-\sqrt{35}$$
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$\sqrt{5} {(\sqrt{3} - \sqrt{7})} = -2.043096437$
