Let f(x) = +2 +9. 1. Find f'(x) = 2. Find the critical numbers for f. Enter your answers as a list of comma separated numbers (for example: 2, -4/3) 3. By hand, find the intervals where f is increasing and decreasing. Then, use the drop down list below to identify the sign of the derivative identified. Select the correct sign chart for f' 4. Identify the x values where f achieves a local maximum and minimum. Enter DNE if no such extrema exists. Maxima occur at x = Minima occur at x=