Active learning (31/2)I. Use the sign chart for f'(x) to determine whether f has a local maximum, a local minimum, or neither at each critical2. Let f(x)=-x32x-5. Find the intervals where f(x) is increasing the intervals on which f(x) is decreasing, and the local extrema.3. The graph of f'(x) is given below:(A) Find the intervals on which f(x) is increasing.(B) Find the intenals on which f(x) is decreasing.(c)x coordinates of the local extrema of f.