Evaluate
27\sqrt{21}\approx 123.729543764
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9\times 3\sqrt{21}
Factor 189=3^{2}\times 21. Rewrite the square root of the product \sqrt{3^{2}\times 21} as the product of square roots \sqrt{3^{2}}\sqrt{21}. Take the square root of 3^{2}.
27\sqrt{21}
Multiply 9 and 3 to get 27.
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