I 18 Prove that the boundaryvalue error term 3 in (3.30) is at most [or1v]. Hint: Show that small values of j are not involved. 30 Show that the recurrence X0 = 111' Xn = x_]2, forn>0, has the solution Xn = [\"2\"], if m is an integer greater than 2, Where on + or,\" = m and a: > 1. For example, if m = 3 the solution is 1+v'3 2 , =43? xn = r2\""1. =