Evaluating an inverting op-amp circuit

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Joined Nov 21, 2012
I need some help evaluating an inverting op-amp circuit that has a bridge circuit at the input side. I have only had half a lecture on op-amps and my textbook does not help at all. First, I have to obtain the Thevenin equivalent at the a and b terminals and use that equivalent to obtain an expression for G=Vo/Vs. Then, I have to evaluate G for R1=R4=100 Ohms, R2=R3=101 Ohms and Rf = 100k Ohms. The only thing I pretty much knew how to do is get the equivalent resistance but everything else is completely baffling me. If I can get help getting the expression for G, I think I can finish the problem but any assistance will be appreciated. The circuit is attached.