- #1

tak13

- 8

- 0

## Homework Statement

I am doing this multiplication with power series and I am just stuck at this one and other questions that similar to this one.

http://img5.imageshack.us/img5/9526/img1261r.jpg [Broken]

## Homework Equations

## The Attempt at a Solution

It seems that I suppose to add n-k wherever I see a "n" but it doesn't seem right.

The highlighted part is the part where I stuck.

The answer for this problem is the one that I circled.

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