Solving for the voltage gain of an inverting op amp 1. The problem statement, all variables and given/known data Find the gain for an inverting op amp. 3. The attempt at a solution I tried to solve for the gain but I ended up getting a positive gain. I think I made a mistake with the current directions but I always thought that when doing nodal analysis, it doesn't matter what direction your current arrows are? Since the math should always work out? I am not too sure... What am I doing wrong?