This app solves the same common problem using three different methods of circuit analysis. The circuit is a common one used on multi-input positive gain op amps. Solving it in 3 different ways can give a student some perspective regarding the 3 methods of analysis. All formulas used at every step is detailed and many partial answers are given to guide the student to do some calculations with checks along the way. Teachers can use app to help make up problem and check solutions.