Evaluate
8\sqrt{5}\approx 17.88854382
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2\times 4\sqrt{5}
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}.
8\sqrt{5}
Multiply 2 and 4 to get 8.
Examples
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