



 
Hi, I expect that you know that to eliminate the surd from the denominator of \[\frac{1}{1 \sqrt3}\] you multiply the numerator and denominator by $1 + \sqrt3 .$ Try the same technique with \[\frac{1}{1  \sqrt[4]2}\] by multiplying the numerator and denominator by $1 + \sqrt[4]2 .$ Penny  


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