3. (8 points) Given f (x) = 6 - 4x + x2, a) Find the equation of the tangent line to f (x) at x=1. 3a) GUAWNHOHNWAVO - 6 -5-4 -3 -2 -10 2 3 4 5 6 b) Sketch a graph of the f(x) function and the tangent line on the same set of axis. 4. (6 points) Given f (x) = 2 - 3x2, using the limit definition of derivative, find f'(x)