Find the exact location of all the relative and absolute extrema of the function.] (Order your answers from smallest to largest x.)
f(x) = x4 − 8x3 with domain [−1, +[infinity])
f has (select)(a relative minimum, a relative maximum, an absolute minimum, an absolute maximum, no extremum,) at (x, y) = ____________
f has (select)(a relative minimum, a relative maximum, an absolute minimum, an absolute maximum, no extremum,) at (x, y) = ____________