Consider the following function. = (x); (2x+1, xs-1 (x-2, x>-1 (a) Find the critical numbers of f. (Enter your answers as a comma-separated list.) x= I (b) Find the open intervals on which the function is increasing or decreasing. (Enter your answers w increasing decreasing (c) Apply the First Derivative Test to identify the relative extremum. (If an answer does not exist, relative maximum (x, y) = -1,-1 relative minimum (x, y) => 0,-2