Evaluate
21\sqrt{3}\approx 36.373066959
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3\sqrt{3}+9\times 2\sqrt{3}
Factor 12=2^{2}\times 3. Rewrite the square root of the product \sqrt{2^{2}\times 3} as the product of square roots \sqrt{2^{2}}\sqrt{3}. Take the square root of 2^{2}.
3\sqrt{3}+18\sqrt{3}
Multiply 9 and 2 to get 18.
21\sqrt{3}
Combine 3\sqrt{3} and 18\sqrt{3} to get 21\sqrt{3}.
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