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

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

$\text{x}\left(\text{n}\right)=3{}^{\text{n}}\cdot \text{u}\left(\text{n}\right)-2{}^{\text{n}-1}\cdot \text{u}\left(\text{n}-1\right)$

$x\left(n\right)=3{}^{n-1}\cdot u\left(n-1\right)+2{}^n\cdot u\left(n\right)$

$\text{x}\left(\text{n}\right)=3{}^{\text{n}-1}\cdot \text{u}\left(\text{n}-1\right)-2{}^{\text{n}-1}\cdot \text{u}\left(\text{n}-1\right)$