Evaluate
-3\sqrt{5}\approx -6.708203932
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-2\sqrt{5}-\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
-3\sqrt{5}
Combine -2\sqrt{5} and -\sqrt{5} to get -3\sqrt{5}.
Examples
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