A causal discrete-time LTI system is described by y [n] - fr [n - 1] + i y [n - 2] = x [n] where x [n] and y [n] are the input and output of the system, respectively.
(a) Determine the frequency response H(fl) of the system.
(b) Find the impulse response h[n] of the system.
(c) Find y [n] if x [n] = q)nu[n].