Evaluate
16\sqrt{7}-1\approx 41.332020977
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20\sqrt{7}-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}.
20\sqrt{7}-4\sqrt{7}-1
Multiply -2 and 2 to get -4.
16\sqrt{7}-1
Combine 20\sqrt{7} and -4\sqrt{7} to get 16\sqrt{7}.
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