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An LTI discrete-time system has the impulse response h[n] = (1.2)^n * u[-n]. Find the system...

An LTI discrete-time system has the impulse response h[n] = (1.2)^n * u[-n]. Find the system response to a unit step input x[n] = u[n].

Please explain the shifting im having a hard time grasping the concept (especially for the U[-n+k] shift

Note:u[n] is the unit step function

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