Evaluate
4-\sqrt{5}\approx 1.763932023
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\frac{12-3\sqrt{5}}{3}
Factor 45=3^{2}\times 5. Rewrite the square root of the product \sqrt{3^{2}\times 5} as the product of square roots \sqrt{3^{2}}\sqrt{5}. Take the square root of 3^{2}.
4-\sqrt{5}
Divide each term of 12-3\sqrt{5} by 3 to get 4-\sqrt{5}.
Examples
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