1. The problem statement, all variables and given/known data G'day, the op-amp circuit is attached. Need to know the Transfer Function. 2. Relevant equations Using Ideal analysis. In=Ip=0A, and Vn=Vp Vo/Vi=-15 3. The attempt at a solution I have had many attempts at it. Because We don't know the input current (no input resister) it has stumped me. As there is no point doin KCL at the first left node. I have many equations but they don't seem to link up. Obviously V1=0V. V2=(2/10)Vo. and Va/18k=-Vi/6k. Any help greatly appreciated.