Evaluate
10\sqrt{21}\approx 45.82575695
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\sqrt{2500-20^{2}}
Calculate 50 to the power of 2 and get 2500.
\sqrt{2500-400}
Calculate 20 to the power of 2 and get 400.
\sqrt{2100}
Subtract 400 from 2500 to get 2100.
10\sqrt{21}
Factor 2100=10^{2}\times 21. Rewrite the square root of the product \sqrt{10^{2}\times 21} as the product of square roots \sqrt{10^{2}}\sqrt{21}. Take the square root of 10^{2}.
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