Multiple choice

Consider the z-transform X(z) = 5z2 + 4z-1 + 3; 0<|z| < $\infty$. The inverse z-transform x[n] is

  1. 5$\delta$[n + 2] + 3$\delta$[n] + 4$\delta$[n - 1]
  2. 5$\delta$[n - 2] + 3$\delta$[n] + 4$\delta$[n + 1]
  3. 5 u[n + 2] + 3 u[n] + 4 u[n - 1]

  4. 5 u[n - 2] + 3 u[n] + 4 u[n + 1]

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A Correct answer
Explanation