Can someone provide step-by-step solutions to the problem? I provided the correct answer from my textbook so that you can check your answer. Thanks in advance!

Find both the first and second derivatives for each of the functions in Exercises 6 ? 17.Locate any relative maximum or minimum points and any points of inflection.Determine the intervals on which the function is concave upwards or concave downwards.

9. f (x) =3x'+6x-8