Rationalize denominators when there are 2 terms with square roots in the denominator. The denominator is
based on the difference of squares product. To rationalize multiply numerator and denominator by the "conjugate"
of the denominator. That is the denominator with the sign in the middle changed. Since (A-B) (A+B) =
and squaring "undoes" a square root.
Rationalize the denominator for
Rationalize the denominator in
This fraction does not reduce. This is the same as: