Evaluate
2\sqrt{61}\approx 15.620499352
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\sqrt{256-12}
Calculate 16 to the power of 2 and get 256.
\sqrt{244}
Subtract 12 from 256 to get 244.
2\sqrt{61}
Factor 244=2^{2}\times 61. Rewrite the square root of the product \sqrt{2^{2}\times 61} as the product of square roots \sqrt{2^{2}}\sqrt{61}. Take the square root of 2^{2}.
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