Consider the function f(x) = 4x - 16. (a) Directly calculate the positive root of the function by setting the function equal to zero and solving for x. x = (b) Use Newton's method to approximate a zero of the function using x0 = 1 as a starting value. x1 = x2 = (c) What value of xo could you use to approximate the other zero of the function? x0 = ?