DTFT question

[l46kok]

Homework Statement

Compute the DTFT of the following signal.

$$x[n] = (0.8)^n u[n]$$

Homework Equations

Properties of DTFT

The Attempt at a Solution

Well, my professor tells me to use the properties of DTFT to solve this. I'd love to - except I don't know what the DTFT of $$(0.8)^n$$ is. I've tried looking it up on the DTFT table, but couldn't find any, can someone tell me what it is?

 

[learningphysics]

It's in the DTFT pairs here:

http://www.neng.usu.edu/classes/ece/5630/notes_transforms.pdf [Broken] on page 20.

but maybe the prof wants you to derive it from the properties you already have in your text?