Find the absolute maximum and absolute minimum of the function \( f(x)=\frac{2 x^{\frac{5}{2}}}{5}-\frac{2 x^{\frac{3}{2}}}{3}-1 \) over the interval \( [0,3] \).
Enter an exact answer. If there is more than one value of \( x \) in the interval at which the maximum or minimum occurs, you should use a comma to separate them.
Provide your answer below:
- Absolute maximum of \( \square \) at \( x= \) \( \square \)
- Absolute minimum of \( \square \) at \( x= \) \( \square \)