Evaluate
3\sqrt{15}+10\sqrt{5}-3\sqrt{215}\approx -10.009005082
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3\sqrt{15}+10\sqrt{5}-3\sqrt{215}
Factor 500=10^{2}\times 5. Rewrite the square root of the product \sqrt{10^{2}\times 5} as the product of square roots \sqrt{10^{2}}\sqrt{5}. Take the square root of 10^{2}.
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