What is the net output voltage for differential amplifier with one op-amp
(a) Vo = -(RF /R1)*Vx
(b) Vo = -(RF /R1)*(Vx -Vy)
(c) Vo = (1+RF /R1)*(Vx -Vy)
(d) None of the mentioned
I had been asked this question during an interview.
This question is from Differential Amplifiers with Multiple Op-Amp topic in portion Operational Amplifier Characteristics of Linear Integrated Circuits