need help with this question

Consider the function f(x) = -x*+-x (2 -6X +3. 3 2 a. Find the derivative of this function and write it below. b. List the points (both x and y coordinates) at which this function has horizontal tangent lines. C. Find the equations of the two horizontal tangent lines. d. Find a point on the graph of ((x) where the tangent line is parallel to the line y = -4x + 3. Hint! There are two points. You only need to find one of them