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**[SOLVED] Op Amp Requivalent Please help!**

**1. Homework Statement**

I'm working on Ideal op amps and I need to find the R equivalent of the system.

I'm not sure if this term is used in other places but R equivalent = total Resistance of the circuit.

http://img169.imageshack.us/img169/4386/reqrk6.png [Broken]

**2. Homework Equations**

**3. The Attempt at a Solution**

I have to place a voltage at the circle at the top left and use the voltage to divide the current to get the Req, but I don't know how to find the current. I think I have to use a current divider at the 10 and 40 k ohms but I can't seem to get the answer of 14 k ohms as the answer in the back of the book. Please help!

I'm also confused if this is the Negative Resistance mentioned in the book. But the given equation for Req = -(R1/R2)R

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