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OpenStudy (anonymous):
5/√(3)+4 simplify
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OpenStudy (mathteacher1729):
\[\frac{5}{\sqrt{3}+4}\cdot \frac{\sqrt{3}-4}{\sqrt{3}-4} = \frac{-20 + 5\sqrt{3}}{-13}\] The trick here is to multiply by the conjugate. http://www.purplemath.com/modules/radicals4.htm This guy has LOTS of awesome videos: http://www.mathtv.com/videos_by_topic
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