Question :
A causal system produces the output sequence y(n)={1,0.7} when excited by the input sequence x(n)={1,-0.7,0.1}, then what is the impulse response of the system function?
1. [3(0.5)n+4(0.2)n]u(n)
2. [4(0.5)n-3(0.2)n]u(n)
3. [4(0.5)n+3(0.2)n]u(n)
4. None of the mentioned
Answer :
2 - [4(0.5)n-3(0.2)n]u(n)
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