Evaluate
2\sqrt{5}\approx 4.472135955
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\frac{4\sqrt{5}}{2}
Factor 80=4^{2}\times 5. Rewrite the square root of the product \sqrt{4^{2}\times 5} as the product of square roots \sqrt{4^{2}}\sqrt{5}. Take the square root of 4^{2}.
2\sqrt{5}
Divide 4\sqrt{5} by 2 to get 2\sqrt{5}.
Examples
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