5.5. Using the partial fraction expansion method, find the inverse of the following z-transforms: z2 -0.3z - 0.04 b, X(z)_(z 0.2)(z+0.4) 0.2) 2 -z 0.5) z0.5) d, X(z) = (z 0.1)2(z-0.6) 5.6. A system is described by the difference equation y(n) 0.5y(n 1 2(0.8u(n