here is what I suggest to rationalize the denominator:
I am uncertain if you mean
(3/(5y+8))/ (3/(5y-8))
or
( (3/5)y + 8)/((3/5)y -8)
3/5y+8
------
3/5y-8
simplify
1 answer
------
3/5y-8
simplify
1 answer