I do not understand how to get the second part

2:57 PM Tue Oct 26 z: 21% @931 E mathxl.com Question 10, 10.4.37 > Hw Score: 91.11%, 13.67 Part 3 of 3 @ Points: 0.67 of 1 Homework: HW 10.4 - The C... Find f'(x) and find the equation of the line tangent to the graph of f at the indicated value of x. Find the value(s) of x where the tangent line is hc f(X)=(6X-8)1/2' x:4 3 l )2 f/(x) = (6x-8 ' 3 The equation of the line tangent to the graph off at x = 4 is y = xx +1 . Select the correct choice below and fill in any answer boxes in your choice. ' A- The tangent line is horizontal at x = (Use a comma to separate answers as needed.) V B. The tangent line is never horizontal