# Homework Help: Convolution of two functions

1. Oct 2, 2011

### Quincy

1. The problem statement, all variables and given/known data
h(t) = u(t) (the unit step function)

x (t) = e-t

3. The attempt at a solution

There is only one interval where the two functions overlap, and that's from 0 to t.

The integral from 0 to t of e-$\tau$ d$\tau$ = -e-t

Doesn't look right to me... what am I doing wrong?

EDIT: This is discrete convolution, by the way.

Last edited: Oct 2, 2011
2. Oct 2, 2011

### vela

Staff Emeritus
e0=1