Evaluate
24\sqrt{5}\approx 53.66563146
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2\times 9\sqrt{5}+\sqrt{245}-\sqrt{5}
Factor 405=9^{2}\times 5. Rewrite the square root of the product \sqrt{9^{2}\times 5} as the product of square roots \sqrt{9^{2}}\sqrt{5}. Take the square root of 9^{2}.
18\sqrt{5}+\sqrt{245}-\sqrt{5}
Multiply 2 and 9 to get 18.
18\sqrt{5}+7\sqrt{5}-\sqrt{5}
Factor 245=7^{2}\times 5. Rewrite the square root of the product \sqrt{7^{2}\times 5} as the product of square roots \sqrt{7^{2}}\sqrt{5}. Take the square root of 7^{2}.
25\sqrt{5}-\sqrt{5}
Combine 18\sqrt{5} and 7\sqrt{5} to get 25\sqrt{5}.
24\sqrt{5}
Combine 25\sqrt{5} and -\sqrt{5} to get 24\sqrt{5}.
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