(1 point) For the function $f(x) = x^3 - 3x^2 + 13$ on the interval $[-1, 4]$, find the absolute extrema, as well as all values of x where they occur.
Absolute maximum of at x =
Absolute minimum of at x =
(If an extremum occurs at multiple values of x, enter them as a comma-separated list like 5, 6, 8.)