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To rationalize a denominator that is the sum or difference of two square roots, you need to recall the factorization of the difference of two squares, namely:
If you multiply the denominator of your fraction by
, you will get
for your new denominator. But in order to introduce that factor into the denominator, you have to multiply the entire fraction by 1 in the form of
Here is the entire expression:
Now, multiply the binomials and simplify: