Evaluate
12\sqrt{7}\approx 31.749015733
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4\sqrt{3}\sqrt{3}\sqrt{7}
Factor 21=3\times 7. Rewrite the square root of the product \sqrt{3\times 7} as the product of square roots \sqrt{3}\sqrt{7}.
4\times 3\sqrt{7}
Multiply \sqrt{3} and \sqrt{3} to get 3.
12\sqrt{7}
Multiply 4 and 3 to get 12.
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