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 Question from Anoushka, a student: if t=1÷[1-√2(order of surd is 4)] , then t=?

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