For f(x)=2x-16x3 + 3 find the following. (A) f'(x) (B) The slope of the graph of f at x= -2 (C) The equation of the tangent line at x = -2 (D) The value(s) of x where the tangent line is horizontal (A) f'(x) = 8x-48x2 (B) At x=-2, the slope of the graph of f is (C) At x 2, the equation of the tangent line is y = (D) The tangent line is horizontal at x = (Use a comma to separate answers as needed.)