Evaluate
-9\sqrt{6}\approx -22.045407685
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-3\times 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}.
-9\sqrt{6}
Multiply -3 and 3 to get -9.
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