Evaluate
4\sqrt{21}\approx 18.33030278
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\sqrt{36+\left(\sqrt{300}\right)^{2}}
Calculate 6 to the power of 2 and get 36.
\sqrt{36+300}
The square of \sqrt{300} is 300.
\sqrt{336}
Add 36 and 300 to get 336.
4\sqrt{21}
Factor 336=4^{2}\times 21. Rewrite the square root of the product \sqrt{4^{2}\times 21} as the product of square roots \sqrt{4^{2}}\sqrt{21}. Take the square root of 4^{2}.
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