- #1

- 493

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## Homework Statement

Hello!

I'm guessing this is precalculus.

There is an intermediate step in a simplifying process and I got to:

[tex]\sum_{x=1}^n

xA^{-Bx}[/tex] Where A is a constant and B is a constant.

## Homework Equations

I was wondering how to write this without the summation sign (similar to sum of squares, etc.):

[tex]\sum_{x=1}^n

xA^{-Bx}[/tex]

(Same equation as above).

## The Attempt at a Solution

I wolfram alphaed it. But it doesn't show the steps, plus I don't use it very often and I'm not sure if it interpreted it the way I meant; I think it did.

I tried a similar thing to the sum of consecutive integers approach, and I tried using the natural log to get rid of the x in the power, but to no avail. How would I begin to approach this problem? Is this one sufficiently complicated that it should be left to looking up on wolfram alpha?!

Any help appreciated.