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\frac{\sqrt{8^{2}-1}}{\left(\sqrt{4}\right)^{2}}
Add 5 and 3 to get 8.
\frac{\sqrt{64-1}}{\left(\sqrt{4}\right)^{2}}
Calculate 8 to the power of 2 and get 64.
\frac{\sqrt{63}}{\left(\sqrt{4}\right)^{2}}
Subtract 1 from 64 to get 63.
\frac{3\sqrt{7}}{\left(\sqrt{4}\right)^{2}}
Factor 63=3^{2}\times 7. Rewrite the square root of the product \sqrt{3^{2}\times 7} as the product of square roots \sqrt{3^{2}}\sqrt{7}. Take the square root of 3^{2}.
\frac{3\sqrt{7}}{4}
The square of \sqrt{4} is 4.