1. The problem statement, all variables and given/known data Given here is an Operational Amplifier, its feeding Voltages are +-10. A) Calculate Vin to get a Vout of -2V, point out the direction of the current in this case (From a to b or b to a) http://img72.imageshack.us/img72/2550/needheed.jpg [Broken] 3. The attempt at a solution http://img844.imageshack.us/img844/4493/blury.jpg [Broken] Is this the right formula? The Vx's are at point a and c, that I know.