Evaluate
3\sqrt{5}\approx 6.708203932
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2\times 2\sqrt{5}-\sqrt{5}+5\sqrt{\frac{0}{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}.
4\sqrt{5}-\sqrt{5}+5\sqrt{\frac{0}{5}}
Multiply 2 and 2 to get 4.
3\sqrt{5}+5\sqrt{\frac{0}{5}}
Combine 4\sqrt{5} and -\sqrt{5} to get 3\sqrt{5}.
3\sqrt{5}+5\sqrt{0}
Zero divided by any non-zero number gives zero.
3\sqrt{5}+5\times 0
Calculate the square root of 0 and get 0.
3\sqrt{5}+0
Multiply 5 and 0 to get 0.
3\sqrt{5}
Anything plus zero gives itself.
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