What is the unit step response of the system described by the differen – McqOptions

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1.	What is the unit step response of the system described by the difference equation? y(n)=0.9y(n-1)-0.81y(n-2)+x(n) under the initial conditions y(-1)=y(-2)=0?
A.	[1.099+1.088(0.9)<sup>n</sup>. (cos( frac{ pi}{3} n+5.2^o) )]u(n)
B.	[1.099+1.088(0.9)<sup>n</sup>. (cos( frac{ pi}{3} n-5.2^o) )]u(n)
C.	[1.099+1.088(0.9)<sup>n</sup>. (cos( frac{ pi}{3} n-5.2^o) )]
D.	None of the mentioned
Answer» C. [1.099+1.088(0.9)<sup>n</sup>. (cos( frac{ pi}{3} n-5.2^o) )]

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