Question 766069
if you meant to write:

{{{
3/(9-sqrt(5))
}}}

then...

{{{
3/(9-sqrt(5))=(3/(9-sqrt(5)))((9+sqrt(5))/(9+sqrt(5)))
}}}


{{{(3/(9-sqrt(5)))((9+sqrt(5))/(9+sqrt(5)))=(27+3sqrt(5))/(81-5)=27/76+(3/76)sqrt(5)
}}}