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OpenStudy (anonymous):
2\sqrt{5}+4\sqrt{5}-3\sqrt{5}
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jimthompson5910 (jim_thompson5910):
\[\large 2\sqrt{5}+4\sqrt{5}-3\sqrt{5}\] \[\large (2+4-3)\sqrt{5}\] \[\large 3\sqrt{5}\] So \[\large 2\sqrt{5}+4\sqrt{5}-3\sqrt{5}=3\sqrt{5}\]
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