Evaluate
20\sqrt{15}\approx 77.459666924
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5\sqrt{240}
Subtract 3 from 243 to get 240.
5\times 4\sqrt{15}
Factor 240=4^{2}\times 15. Rewrite the square root of the product \sqrt{4^{2}\times 15} as the product of square roots \sqrt{4^{2}}\sqrt{15}. Take the square root of 4^{2}.
20\sqrt{15}
Multiply 5 and 4 to get 20.
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