Evaluate
21\sqrt{345}\approx 390.057688041
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7\sqrt{3105}
Multiply 69 and 45 to get 3105.
7\times 3\sqrt{345}
Factor 3105=3^{2}\times 345. Rewrite the square root of the product \sqrt{3^{2}\times 345} as the product of square roots \sqrt{3^{2}}\sqrt{345}. Take the square root of 3^{2}.
21\sqrt{345}
Multiply 7 and 3 to get 21.
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