X 1hr57mins X 3 4) (15 pts) Use f'(a) = lim f(ath)-f(a) h -+0 to find f '(a) and the equation of the tangent line of the function at the h given point. f (x) = 3x2 - 2x+12 at a =-2. 2 f '( - 2) : Tangent line: 3