Evaluate
\sqrt{2021}-2\sqrt{505}\approx 0.011123477
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\sqrt{2021}-\sqrt{2020+0}
Add 2020 and 1 to get 2021.
\sqrt{2021}-\sqrt{2020}
Add 2020 and 0 to get 2020.
\sqrt{2021}-2\sqrt{505}
Factor 2020=2^{2}\times 505. Rewrite the square root of the product \sqrt{2^{2}\times 505} as the product of square roots \sqrt{2^{2}}\sqrt{505}. Take the square root of 2^{2}.
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