Evaluate
20\sqrt{7}\approx 52.915026221
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\sqrt{6400-60^{2}}
Calculate 80 to the power of 2 and get 6400.
\sqrt{6400-3600}
Calculate 60 to the power of 2 and get 3600.
\sqrt{2800}
Subtract 3600 from 6400 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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