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**1. Homework Statement**

The problem could be any variation of dx/(x

^{2}-2x)

**2. Homework Equations**

∫dx/x

^{2}-a

^{2}= 1/2a ln ((x-a)/(x+a)) + C

**3. The Attempt at a Solution**

I understand the answer to be 1/2 ln ((x-2)/x) + C

My question is why is it just x on the bottom in the solution? Shouldnt it be x+2 since the equation states "x+a"? Similar to the way it is x-2 on the top which makes sense since the formula states "x-a". Any help is greatly appreciated.