83f-6f30-4462-965b-fcce9fd868f2.pdf Q 9/C/42 b. Draw a sketch of f' (x) [4 - T] 3. If f'(x) is the graph below sketch a possible graph of f"(x) [4 - T] -2 0 18 ot N / 13 K /14 A / 14 C / 12 T This represents an equation of the form, Ax + By + Cz = 0, which is a plane most easily sketched using the fact that a plane is uniquely determined by three points. The following example illustrates this approach