Question 1157254
i believe what you are trying to do there is rationalize the denominator in order to simplify the fraction.
see my worksheet below.
here's a reference:
<a href = "https://www.mathsisfun.com/algebra/rationalize-denominator.html" target = "_blank">https://www.mathsisfun.com/algebra/rationalize-denominator.html</a>
there is also the concept of simplifying the radical first.
this next reference discusses that as well as rationalizing the denominator.
<a href = "https://www.wtamu.edu/academic/anns/mps/math/mathlab/int_algebra/int_alg_tut41_rationalize.htm" target = "_blank">https://www.wtamu.edu/academic/anns/mps/math/mathlab/int_algebra/int_alg_tut41_rationalize.htm</a>
here'smy worksheet.
<img src = "http://theo.x10hosting.com/2020/042701.jpg" alt="$$$" >