Evaluate
3\sqrt{77}-2\sqrt{3}-1\approx 21.860791547
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7-2\sqrt{3}-8+3\sqrt{77}
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}.
-1-2\sqrt{3}+3\sqrt{77}
Subtract 8 from 7 to get -1.
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