1. The problem statement, all variables and given/known data The question is Derive an expression for the closed loop gain of the differential amplifier. I have solutions for these questions but the solution for this question is quite vague. Here is the solution: I understand part 1 and part 3, but part 2 I don't. So looking at part 2, it starts by doing a voltage divider to find the voltage at V* by doing V1 x R4/R3xR4 The rest of the step in part 2, I don't understand. How does it go from from V* = V1 x R4/R3xR4 then to = V1/(R1 + R3/R4) then to = (V1 x R4/R3)/(1 + R4/R3) Is there some steps that should be in between to show more clearly what is happening because I can't follow it. Can someone explain how to get from each step to the next?