er the function below. ((x) = -4x2+ 16x + 1 (a) Find the critical numbers of f. (Enter your answers as a comma-separated list.) X= 2,17 X (b) Find the open intervals on which the function is increasing or decreasing, (Enter your answer using Interval notation. If an answer does not exist, enter DNE.) increasing dne X decreasing dne X (c) Apply the First Derivative Test to Identify the relative extrema, (If an answer does not exist, enter DNE!) relative minimum (x, y) - dne relative maximum (x, y) 2,17 bmit