Let a, b, c and d be the last 4 digits of your student ID number (if any of them are zero then change those to 7's) and consider the function ax - b f ( ac) = x2 + d A. Find all points where f' (a) = 0 B. Find the equation of the tangent line at x = c C. Plot a beautiful graph in Desmos that shows f() and the tangent line you found in part (B)