(3 \sqrt{ 5 } - \sqrt{ 20 }
Evaluate
\sqrt{5}\approx 2.236067977
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3\sqrt{5}-2\sqrt{5}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
\sqrt{5}
Combine 3\sqrt{5} and -2\sqrt{5} to get \sqrt{5}.
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