(3+ \sqrt{ 6)(3- \sqrt{ 6) } }
Evaluate
3\left(\sqrt{6}-1\right)\approx 4.348469228
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3+3\sqrt{6}-\left(\sqrt{6}\right)^{2}
Use the distributive property to multiply \sqrt{6} by 3-\sqrt{6}.
3+3\sqrt{6}-6
The square of \sqrt{6} is 6.
-3+3\sqrt{6}
Subtract 6 from 3 to get -3.
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