Evaluate
4\sqrt{7}-1\approx 9.583005244
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2\times 2\sqrt{7}-1
Factor 28=2^{2}\times 7. Rewrite the square root of the product \sqrt{2^{2}\times 7} as the product of square roots \sqrt{2^{2}}\sqrt{7}. Take the square root of 2^{2}.
4\sqrt{7}-1
Multiply 2 and 2 to get 4.
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