Evaluate
3\sqrt{15}\approx 11.618950039
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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}.
3\sqrt{15}
Combine \sqrt{15} and 2\sqrt{15} to get 3\sqrt{15}.
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