Evaluate
-\sqrt{2}-3\sqrt{3}\approx -6.610365985
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2\sqrt{2}-2\sqrt{3}-\sqrt{3}-3\sqrt{2}
Combine -3\sqrt{3} and \sqrt{3} to get -2\sqrt{3}.
2\sqrt{2}-3\sqrt{3}-3\sqrt{2}
Combine -2\sqrt{3} and -\sqrt{3} to get -3\sqrt{3}.
-\sqrt{2}-3\sqrt{3}
Combine 2\sqrt{2} and -3\sqrt{2} to get -\sqrt{2}.
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