What you actually found, it's the upper bound.
What's this? An improper integral? A series? Also, you didn't say for what you're working on.
the question is does this converge or diverge and if it converges give its upper bound..
what i have is by comparison
and
so
and i know that converges
but not sure how to get the upper bound, can someone explain to me how to get the upper bound please! thank you