Hãy tìm x ( n ) biết .   X ( Z ) = Z 4 ( Z − 2 ) ( Z − 3 )   với | Z | > 3

$x\left(n\right)=3{}^{n-3}\cdot u\left(n+3\right)-2{}^{n-3}\cdot u\left(n+3\right)$

$x\left(n\right)=3{}^{n+3}\cdot u\left(n+3\right)-2{}^{n+3}\cdot u\left(n+3\right)$

$x\left(n\right)=3{}^{n+3}\cdot u\left(n+3\right)+2{}^{n+3}\cdot u\left(n+3\right)$

$x\left(n\right)=3{}^{n+4}\cdot u\left(n+3\right)-2{}^{n+4}\cdot u\left(n+3\right)$