A graphing device is recommended. A function is given. f(x) = X3 - 4x (a) Find the local maximum and minimum values of the function and the value of x at which each occurs. State each answer rounded to two decimal places. local maximum (x, y) = local minimum (x, y) = (b) Find the intervals on which the function is increasing and on which the function is decreasing. State each answer rounded to two decimal places. (Enter your answers using interval notation.) increasing decreasing