Evaluate
2\sqrt{41}\approx 12.806248475
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\sqrt{169-5}
Calculate 13 to the power of 2 and get 169.
\sqrt{164}
Subtract 5 from 169 to get 164.
2\sqrt{41}
Factor 164=2^{2}\times 41. Rewrite the square root of the product \sqrt{2^{2}\times 41} as the product of square roots \sqrt{2^{2}}\sqrt{41}. Take the square root of 2^{2}.
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