Evaluate
2-\sqrt{7}\approx -0.645751311
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\frac{8-4\sqrt{7}}{4}
Factor 112=4^{2}\times 7. Rewrite the square root of the product \sqrt{4^{2}\times 7} as the product of square roots \sqrt{4^{2}}\sqrt{7}. Take the square root of 4^{2}.
2-\sqrt{7}
Divide each term of 8-4\sqrt{7} by 4 to get 2-\sqrt{7}.
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