I'm on one of the more difficult practice problems on Excercise 1-6 in "AoPS:Vol. 1".
I have tried rationalizing the above fraction by multiplying it's conjugate by itself, however, how can we FOIL the two terms when there appears to only be one?
Overall Questions: 1. How the Conjugate Radical be the same as the original expression? If so, why? 2. How can we rationalize a fraction like this which appears to have only one term, when rationalization by conjugate radicals always requires two?