I've been trying to do this problem forever. I'm not sure how to type this so I took a screenshot of the problem:
I have no idea how to do this. From what I could gather in my notes, I started off like this:
For the unit step functions of f(t):
t^2 - t^2U(t-1)
(t^2 - 1)U(t-1) - (t^2 - 1)U(t-2)
(t^2 - 1)U(t-2)
These may not be right... and even if they are right, can someone briefly explain why? I still don't have a thorough understanding of this.