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3 ----- -2+√13
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are you asking for the answer to \[\frac{ 3 }{ -2 + \sqrt{13} }\]?
if so the first step would be to move the \[\sqrt{13}\] to the top by doing \[\frac{ 3 }{ -2 + \sqrt{13} } * \frac{ \sqrt{13} }{ \sqrt{13} } = \frac{ 3 \sqrt{13} }{ -2 + 13 } = \frac{ 3\sqrt{13} }{ 11 }\]
hmmm
that is not going to work sorry
\[\frac{ 3 }{ -2 + \sqrt{13} }\times \frac{-2-\sqrt{13}}{-2-\sqrt{13}}\]is what you need to get rid of the radical in the denominator
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yes, multiplying the numerator and the denominator by the radical you are trying to remove does that
\[\sqrt{13} * \sqrt{13} = 13\]
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