What is the z-transform of the signal x(n)=[5(3n)-9(7n)]u(n)? – McqOptions

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1.	What is the z-transform of the signal x(n)=[5(3ⁿ)-9(7ⁿ)]u(n)?
A.	( frac{5}{1-3z^{-1}}- frac{9}{1-7z^{-1}} )
B.	( frac{5}{1+3z^{-1}}- frac{9}{1+7z^{-1}} )
C.	( frac{5}{1-3z}- frac{9}{1-7z} )
D.	None of the mentioned
Answer» B. ( frac{5}{1+3z^{-1}}- frac{9}{1+7z^{-1}} )

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