Evaluate
-\sqrt{15}\approx -3.872983346
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\sqrt{15}-2\sqrt{15}
Factor 60=2^{2}\times 15. Rewrite the square root of the product \sqrt{2^{2}\times 15} as the product of square roots \sqrt{2^{2}}\sqrt{15}. Take the square root of 2^{2}.
-\sqrt{15}
Combine \sqrt{15} and -2\sqrt{15} to get -\sqrt{15}.
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