Evaluate
29-12\sqrt{5}\approx 2.16718427
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29-2\times 6\sqrt{5}
Factor 180=6^{2}\times 5. Rewrite the square root of the product \sqrt{6^{2}\times 5} as the product of square roots \sqrt{6^{2}}\sqrt{5}. Take the square root of 6^{2}.
29-12\sqrt{5}
Multiply -2 and 6 to get -12.
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