Answer
No relative extrema.
Work Step by Step
First derivative
\[
x^{-2 / 3}+2=f^{\prime}(x)
\]
Critical points (zeros of first derivative or point where the first derivative does not exist):
\[
x=0
\]
No relative extrema
$f^{\prime}(x)>0$ on the right of $x=0$ on the left. Since no change in the first derivative exists, it is not a relative extrema.