Cho X ( Z ) = Z − 4 Z − 2 vớ i | Z | > 2 , thì:

$IZT\left[\frac{z{}^{-4}}{z-2}\right]=2{}^{n-5}u\left(n+5\right)$

$IZT\left[\frac{z{}^{-4}}{z-2}\right]=-2{}^{n-5}u\left(n-5\right)$

$IZT\left[\frac{z{}^{-4}}{z-2}\right]=2{}^{n+5}u\left(n-5\right)$

$IZT\left[\frac{Z{}^{-4}}{Z-2}\right]=2{}^{n-5}u\left(n-5\right)$