Explain why Newton's method doesn't work for finding the root of the equation x-3x+9= 0 if the initial approximation is chosen to be x = 1. f(x) = x-3x+9= f'(x) = in trying to ---Select--- by zero. If x1 = 1, then f'(x1) = and the tangent line used for approximating x2 is ---Select--- . Attempting to find X2