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## Homework Statement

This is from an example problem in my textbook.

Here's a link to a picture of the integral I'm having trouble with:

http://puu.sh/3ApyU.png [Broken]

It shows the answer but I'm really not sure how they got there, or where to begin really. How do I integrate in terms of y with those x's in there? Any help would be appreciated.

Edit:

Guess it'd help if y'all could see the problem. I searched for it online and this is basically it:

http://puu.sh/3Aq4f.png [Broken]

Only difference is this one's from 0 to a while mine is -a to a. Also, my question just reads "Find the electric field at point P on the x-axis at a distance x from the origin." I understand everything up to solving the integral for the x-component

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