Evaluate
2\sqrt{10}\approx 6.32455532
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\sqrt{40}
Multiply 5 and 8 to get 40.
2\sqrt{10}
Factor 40=2^{2}\times 10. Rewrite the square root of the product \sqrt{2^{2}\times 10} as the product of square roots \sqrt{2^{2}}\sqrt{10}. Take the square root of 2^{2}.
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