Evaluate
2\sqrt{42}\approx 12.961481397
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\sqrt{28\times 6}
Calculate the square root of 36 and get 6.
\sqrt{168}
Multiply 28 and 6 to get 168.
2\sqrt{42}
Factor 168=2^{2}\times 42. Rewrite the square root of the product \sqrt{2^{2}\times 42} as the product of square roots \sqrt{2^{2}}\sqrt{42}. Take the square root of 2^{2}.
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