1. The problem statement, all variables and given/known data The problem could be any variation of dx/(x2-2x) 2. Relevant equations ∫dx/x2-a2 = 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.