engineering recuitment NIELIT Scientific Assistant Mock Test 2025 Signals and Systems Z Transform

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

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