Evaluate
-2\sqrt{3}-12\approx -15.464101615
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-2\sqrt{3}-4\left(\sqrt{3}\right)^{2}
Use the distributive property to multiply -2\sqrt{3} by 1+2\sqrt{3}.
-2\sqrt{3}-4\times 3
The square of \sqrt{3} is 3.
-2\sqrt{3}-12
Multiply -4 and 3 to get -12.
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