Evaluate
\frac{2\sqrt{105}+1}{5}\approx 4.298780306
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\frac{2\sqrt{105}+1}{5}
Factor 420=2^{2}\times 105. Rewrite the square root of the product \sqrt{2^{2}\times 105} as the product of square roots \sqrt{2^{2}}\sqrt{105}. Take the square root of 2^{2}.
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