1.

What is the impulse response of the system described by the second order difference equation y(n)-3y(n-1)-4y(n-2)=x(n)+2x(n-1)?

A. [-\(\frac{1}{5}\) (-1)n–\(\frac{6}{5}\) (4)n]u(n)
B. [\(\frac{1}{5}\) (-1)n–\(\frac{6}{5}\) (4)n]u(n)
C. [\(\frac{1}{5}\) (-1)n+\(\frac{6}{5}\) (4)n]u(n)
D. [-\(\frac{1}{5}\) (-1)n+\(\frac{6}{5}\) (4)n]u(n)
Answer» E.


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