Evaluate
2\sqrt{21}+11-3\sqrt{7}\approx 12.227897457
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-3\sqrt{7}+11+10-7+2\sqrt{21}-3
Combine \sqrt{7} and -4\sqrt{7} to get -3\sqrt{7}.
-3\sqrt{7}+21-7+2\sqrt{21}-3
Add 11 and 10 to get 21.
-3\sqrt{7}+14+2\sqrt{21}-3
Subtract 7 from 21 to get 14.
-3\sqrt{7}+11+2\sqrt{21}
Subtract 3 from 14 to get 11.
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