(Solved): a linear time invariant system is defined by the difference equation y(n)=x(n-1)+x(n-1)+x(n-2) de ...

a linear time invariant system is defined by the difference equation y(n)=x(n-1)+x(n-1)+x(n-2) determine the impulse response of the system and after sketch it determine the output of the system when the input is step input which is x(n)=u(n)