Please show the detailed steps:
Compute the unit-pulse response h[n] for the discrete-time system y[n+2]+2y[n+1]+y[n]=x[n] (for n = 0, 1, 2, 3).
=> y[n+2] = - 2 y[n+1] - y[n] + x[n]
h[n+2] = - 2 ...
For a given discrete-time system, this solution provides a detailed, step-wise response which estimates the unit pulse response. All work which is required is shown.