Consider the function f x x2 4x 8 a 5 pts Use the limit definition of derivative to find f x You must show all your work Tim 116 lim X h 4 8 X 4X 8 h 2 X 2th th 48 8 X 4x 8 2 xh th h 140 lim 70 n lim h 0 2X 2 X how b 5 pts Find the x values where the tangent line to f x is horizontal You must show all your work 2 f x 2 4 2 8 0 4 8 8 0 set fc then Solv 4 0 4 F X 4 f a