Electrical Engineering > GATE 2015 SET-2 > Z-Transform
The z-Transform of a sequence x[n] is given as X(z) = 2z + 4 - 4/z + 3/z2. If y[n] is the first difference of x[n], then Y(z) is given by
A
2z+2-8/z+7/z2-3/z3
B
-2z+2-6/z+1/z2-3/z3
C
-2z-2+8/z-7/z2+3/z3
D
4z-2-8/z-1/z2+3/z3

Correct : a

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