Evaluate
17\sqrt{5}\approx 38.013155617
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2\times 2\sqrt{5}\sqrt{25}-3\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}.
4\sqrt{5}\sqrt{25}-3\sqrt{5}
Multiply 2 and 2 to get 4.
4\sqrt{5}\times 5-3\sqrt{5}
Calculate the square root of 25 and get 5.
20\sqrt{5}-3\sqrt{5}
Multiply 4 and 5 to get 20.
17\sqrt{5}
Combine 20\sqrt{5} and -3\sqrt{5} to get 17\sqrt{5}.
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