Evaluate
-3\sqrt{3}\approx -5.196152423
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-3\times 2\sqrt{3}+3\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}.
-6\sqrt{3}+3\sqrt{3}
Multiply -3 and 2 to get -6.
-3\sqrt{3}
Combine -6\sqrt{3} and 3\sqrt{3} to get -3\sqrt{3}.
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