Evaluate
128\sqrt{31}\approx 712.673838442
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64\times 2\sqrt{31}
Factor 124=2^{2}\times 31. Rewrite the square root of the product \sqrt{2^{2}\times 31} as the product of square roots \sqrt{2^{2}}\sqrt{31}. Take the square root of 2^{2}.
128\sqrt{31}
Multiply 64 and 2 to get 128.
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