Consider the equation below. (If you need to use - or , enter -INFINITY or INFINITY.) f(x) = 4x3 + 3x-6x + 1 (a) Find the intervals on which fis increasing. (Enter the interval that contains smaller numbers first.) ( |JU ( Find the interval on which fis decreasing. ( (b) Find the local minimum and maximum values of f. (max) (min) (c) Find the inflection point. ( Find the interval on which fis concave up. ( ) Find the interval on which fis concave down. )