Question 133239
rationalize the denominator. It is a number 1 in the (numerator)over top of a square root of 7 minus a square root of 5 in the denominator
-------------------
1/(sqrt(7) - sqrt(5))
Multiply numerator and denominator by sqrt(7) + sqrt(5) to get:

= [sqrt(7) + sqrt(5)] / [7-5]

= [sqrt(7) + sqrt(5)]/2
============================
Cheers,
Stan H.