Find the absolute maximum and absolute minimum values of the function, if they exist, over the indicated interval. When no interval is specified, use the real line (-∞, ∞).
f(x) = -

x
3 + 4x - 1; (-∞, 0)
◦ Absolute minimum: -4.3; absolute maximum: 6.3
◦ No absolute maximum; absolute minimum: -6.3
◦ Absolute maximum: 2; absolute minimum: -2
◦ No absolute extrema