17. Each equation below is a characteristic equation for a recurrence relation. Find the general solution for each recurrence relation. (a) (x 2)(x 4) = 0 (b) (x 3)(x 3) = 0 (c) (x+3)(x+3) = 0 (d) (x - 1)(x + 2)(x - 5) = 0 (e) (x + 1)(x + 7) = 0