I think i have it figured out.
I will post my understanding and then maybe someone can comment on whether I was right.
My idea of k<0 was right but only if n > 0 which would make the second term u[n-k] always positive also giving us a SUM a^-k and then we flip the summation around cause we...
I am trying to see if I understand the convolution process correctly.
This is from the solved example of my prof's notes:
x[n] = u[n]
and h[n] = a-nu[-n] for 0<a<1
As expected the first step was
y[n] = x[n]* h[n]
= Ʃ h[k]x[n-k] -∞<k<∞
= Ʃ a-ku[-k]u[n-k] -∞<k<∞
From my...