$$\sqrt{ \frac{ { 4 }^{ 2 } + { 6 }^{ 2 } + { 7 }^{ 2 } + { 8 }^{ 2 } + { 10 }^{ 2 } + { 12 }^{ 2 } + { 16 }^{ 2 } }{ 7 } - { 9 }^{ 2 } }$$
$\sqrt{14}\approx 3.741657387$
$$\sqrt{\frac{16+6^{2}+7^{2}+8^{2}+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{16+36+7^{2}+8^{2}+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{52+7^{2}+8^{2}+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{52+49+8^{2}+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{101+8^{2}+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{101+64+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{165+10^{2}+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{165+100+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{265+12^{2}+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{265+144+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{409+16^{2}}{7}-9^{2}}$$
$$\sqrt{\frac{409+256}{7}-9^{2}}$$
$$\sqrt{\frac{665}{7}-9^{2}}$$
$$\sqrt{95-9^{2}}$$
$$\sqrt{95-81}$$
$$\sqrt{14}$$
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