In partial fraction expansion method, the function *X*(*z*) is expressed as follows:

where *α*_{1}, *α*_{2}, *α*_{3}, ............ and *α _{m}* are the constants and

If the *z*-transform is rational in nature which can be expressed as the ratio of two polynomials as follows

Let *b*0 = 1. If *b*_{0} ≠ 1, the polynomials ...

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