appropriate respons Find the critical values and determine the intervals where f x is increasing and the intervals where f x is decreasing for the function f x x3 3x2 24x 6 O increasing on 4 u 2 0 decreasing on 4 O decreasing on 4 u 2 increasing on 4 2 O increasing on 4 u 2 0 decreasing on 4 2 increasing on 4 decreasing on 4 2