4. (10 pts) Let f (x) = x - 3x - 4. The graph of f(x) is shown below. These questions deal with the Newton's method. In what follows you are to take xo = 3. a) Find the equation of the first tangent line at xo . b) Use your answer in (b) to find the value of x1. c) Use your calculator to find x2 and X3. Do not round your answers