Third-order IIR system Using MATLAB

#OLVERAONLINE Consider the causal and stable system, Third-order IIR system Using MATLAB
a)Plot the pole-zero pattern using the function zplane(a,b).
b)Compute and plot the impulse response using the functions filter and stem. Compare with the plot obtained using the function impz.
c) Use the function residuez and the z-transform pairs to find an analytical expression for the impulse response h[n].