$$\sqrt{ { -2 }^{ 2 } + { \left(- \sqrt{ 7 } \right) }^{ 2 } }$$
$\sqrt{11}\approx 3.31662479$
$$\sqrt{4+\left(-\sqrt{7}\right)^{2}}$$
$$\sqrt{4+\left(\sqrt{7}\right)^{2}}$$
$$\sqrt{4+7}$$
$$\sqrt{11}$$
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