Solution 2.9.4.7 F(s)= A s + B s;2 : A = [[sF(s)]] s=0 =  1 s;2  s=0 = ;0:5 B = [[(s;2)F(s)]] s=2 =  1 s  s=2 =0:5 f(t)=[;0:5=0:5e 2t ]1(t): 1