Evaluate
18\sqrt{65}\approx 145.120639469
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9\sqrt{260}
Multiply 52 and 5 to get 260.
9\times 2\sqrt{65}
Factor 260=2^{2}\times 65. Rewrite the square root of the product \sqrt{2^{2}\times 65} as the product of square roots \sqrt{2^{2}}\sqrt{65}. Take the square root of 2^{2}.
18\sqrt{65}
Multiply 9 and 2 to get 18.
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