Evaluate
140\sqrt{210}\approx 2028.792744467
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70\times 2\sqrt{210}
Factor 840=2^{2}\times 210. Rewrite the square root of the product \sqrt{2^{2}\times 210} as the product of square roots \sqrt{2^{2}}\sqrt{210}. Take the square root of 2^{2}.
140\sqrt{210}
Multiply 70 and 2 to get 140.
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