Evaluate
4\sqrt{7}-\sqrt{22}\approx 5.892589484
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4\sqrt{7}-\sqrt{22}
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}.
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