Evaluate
21\sqrt{2}\approx 29.69848481
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3\sqrt{7}\sqrt{7}\sqrt{2}
Factor 14=7\times 2. Rewrite the square root of the product \sqrt{7\times 2} as the product of square roots \sqrt{7}\sqrt{2}.
3\times 7\sqrt{2}
Multiply \sqrt{7} and \sqrt{7} to get 7.
21\sqrt{2}
Multiply 3 and 7 to get 21.
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