Evaluate
20\sqrt{7}\approx 52.915026221
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\sqrt{400+40^{2}+800}
Calculate 20 to the power of 2 and get 400.
\sqrt{400+1600+800}
Calculate 40 to the power of 2 and get 1600.
\sqrt{2000+800}
Add 400 and 1600 to get 2000.
\sqrt{2800}
Add 2000 and 800 to get 2800.
20\sqrt{7}
Factor 2800=20^{2}\times 7. Rewrite the square root of the product \sqrt{20^{2}\times 7} as the product of square roots \sqrt{20^{2}}\sqrt{7}. Take the square root of 20^{2}.
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