Evaluate
4\sqrt{5}\approx 8.94427191
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\sqrt{4}\sqrt{5}\sqrt{4}
Factor 20=4\times 5. Rewrite the square root of the product \sqrt{4\times 5} as the product of square roots \sqrt{4}\sqrt{5}.
4\sqrt{5}
Multiply \sqrt{4} and \sqrt{4} to get 4.
Examples
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