Evaluate
3\sqrt{6}\approx 7.348469228
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\sqrt{54}
Subtract 18 from 72 to get 54.
3\sqrt{6}
Factor 54=3^{2}\times 6. Rewrite the square root of the product \sqrt{3^{2}\times 6} as the product of square roots \sqrt{3^{2}}\sqrt{6}. Take the square root of 3^{2}.
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