Evaluate
-\frac{3\sqrt{2}}{2}\approx -2.121320344
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1+2-3-\sqrt{2}-\frac{1}{2}\sqrt{2}
Subtract 2 from 3 to get 1.
3-3-\sqrt{2}-\frac{1}{2}\sqrt{2}
Add 1 and 2 to get 3.
-\sqrt{2}-\frac{1}{2}\sqrt{2}
Subtract 3 from 3 to get 0.
-\frac{3}{2}\sqrt{2}
Combine -\sqrt{2} and -\frac{1}{2}\sqrt{2} to get -\frac{3}{2}\sqrt{2}.
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