Evaluate
\sqrt{10}\approx 3.16227766
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\frac{2\sqrt{10}}{2}
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}.
\sqrt{10}
Cancel out 2 and 2.
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