The figure below shows f(x) and its local linearization at x = a, y = 4x-4. (The local linearization is shown in blue.) What is the value of a? a = _____ What is the value of f(a)? f(a) = _____ Use the linearization to approximate the value of f(3.2). f(3.2) = _____ Is the approximation an under- or overestimate?