Evaluate
4\sqrt{70}\approx 33.466401061
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2\times 2\sqrt{70}
Factor 280=2^{2}\times 70. Rewrite the square root of the product \sqrt{2^{2}\times 70} as the product of square roots \sqrt{2^{2}}\sqrt{70}. Take the square root of 2^{2}.
4\sqrt{70}
Multiply 2 and 2 to get 4.
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