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OpenStudy (anonymous):
subtract rad45-rad80
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OpenStudy (anonymous):
\[\sqrt{45}-\sqrt{80}=\sqrt{3^2*5}-\sqrt{2^2*2^2*5}\]
OpenStudy (anonymous):
\[3\sqrt{5}-4\sqrt{5}=-\sqrt{5}\]\[\sqrt{-1}*\sqrt{5}=i \sqrt{5}\]
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