Homework Set 4 Problem 4 . Inverse z-transforms.
Hint – look at the region of convergence to see whether you are expecting a signal that dies away as t tends to + infinity, or as t tends to – infinity.

Homework Set 4 Problem 3

Homework Set 4 Problem 2

Homework Set 4 – Problem 1

Note to get the zeros of this z-transform, you have to combine the two parts and get it in the B(z)/A(z) form, where A(z) can be left  in factored form (z-a)(z+b).   You will then need to find the roots of B(z).

Homework Set 3