Evaluate
16\sqrt{19}-21\sqrt{17}\approx -16.842835041
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-2\sqrt{17}-\sqrt{19}-19\sqrt{17}+17\sqrt{19}
Combine 3\sqrt{17} and -5\sqrt{17} to get -2\sqrt{17}.
-21\sqrt{17}-\sqrt{19}+17\sqrt{19}
Combine -2\sqrt{17} and -19\sqrt{17} to get -21\sqrt{17}.
-21\sqrt{17}+16\sqrt{19}
Combine -\sqrt{19} and 17\sqrt{19} to get 16\sqrt{19}.
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