Evaluate
2013-2\sqrt{5}\approx 2008.527864045
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\sqrt{4052153+16}-\sqrt{20}
Multiply 2009 and 2017 to get 4052153.
\sqrt{4052169}-\sqrt{20}
Add 4052153 and 16 to get 4052169.
2013-\sqrt{20}
Calculate the square root of 4052169 and get 2013.
2013-2\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
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