Use the function below to answer parts a and b 19 f x 4x 2 5x on 2 2 a Find the critical points of the function on the given interval The critical point s occur at x Simplify your answer Use a comma to separate answers as needed Type an exact answer using radicals as needed b Use a graphing utility to determine whether each critical point corresponds to a local maximum local minimum or neither Select the correct choice below if necessary fill in the answer box to complete your choice A 15 The critical point s x correspond s to the local maximum maxima Simplify your answer Use a comma to separate answers as needed Type an exact answer using radicals as needed OB There is no local maximum Select the correct choice below and if necessary fill in the answer box to complete your choice A to the local minimum minima