Question

What is the one sided z-transform X^+(z) of the signal x(n)={1,2,5,7,0,1}?

(a) z^2+2z+5+7z^-1+z^-3

(b) 5+7z+z^3

(c) z^-2+2z^-1+5+7z+z^3

(d) 5+7z^-1+z^-3

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Answer 1

Right answer is (d) 5+7z^-1+z^-3

The best explanation: Since the one sided z-transform is valid only for n>=0, the z-transform of the given signal will be X^+(z)= 5+7z^-1+z^-3.