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2\sqrt{7}\sqrt{3}\sqrt{7}
Factor 21=7\times 3. Rewrite the square root of the product \sqrt{7\times 3} as the product of square roots \sqrt{7}\sqrt{3}.
2\times 7\sqrt{3}
Multiply \sqrt{7} and \sqrt{7} to get 7.
14\sqrt{3}
Multiply 2 and 7 to get 14.