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**[SOLVED] Circuits Op Amp R equilvalent 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. 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!

**3. Relevant equations**

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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