Evaluate
4\sqrt{26}\approx 20.396078054
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\sqrt{400+4^{2}}
Calculate 20 to the power of 2 and get 400.
\sqrt{400+16}
Calculate 4 to the power of 2 and get 16.
\sqrt{416}
Add 400 and 16 to get 416.
4\sqrt{26}
Factor 416=4^{2}\times 26. Rewrite the square root of the product \sqrt{4^{2}\times 26} as the product of square roots \sqrt{4^{2}}\sqrt{26}. Take the square root of 4^{2}.
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