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)?

[- ( frac{1}{5} ) (-1)n ( frac{6}{5} ) (4)n]u(n)

[ ( frac{1}{5} ) (-1)n ( frac{6}{5} ) (4)n]u(n)

[ ( frac{1}{5} ) (-1)n+ ( frac{6}{5} ) (4)n]u(n)

[- ( frac{1}{5} ) (-1)n+ ( frac{6}{5} ) (4)n]u(n)

What is the impulse response of the system described by the second ord

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)<sup>n</sup> ( frac{6}{5} ) (4)<sup>n</sup>]u(n)
B.	[ ( frac{1}{5} ) (-1)<sup>n</sup> ( frac{6}{5} ) (4)<sup>n</sup>]u(n)
C.	[ ( frac{1}{5} ) (-1)<sup>n</sup>+ ( frac{6}{5} ) (4)<sup>n</sup>]u(n)
D.	[- ( frac{1}{5} ) (-1)<sup>n</sup>+ ( frac{6}{5} ) (4)<sup>n</sup>]u(n)
Answer» E.