To determine end behavior, we only have to look at the leading term.
First, the leading term is positive, so we won't have to negate anything.
The leading term has a power that is odd.
Since the exponent is odd, this means that the function goes to positive infinity as x goes to positive infinity.
This also means that the function goes to negative infinity as x goes to negative infinity.
Those are the end behaviors.
Have an awesome day! :)