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## Homework Statement

Determine the Thevenin equivalent with respect to the terminals a,b.

## Homework Equations

Rth=Voc/Isc

## The Attempt at a Solution

Right now I'm just trying to calculate Rth by removing the sources from the circuit. When I calculated the Rth using the node voltage/mesh current method I calculated it to be 20 kΩ.

So right now my idea is I have to short out the voltage source and open the current source.

I think(?) this means the 2kΩ, 20kΩ, and 5kΩ(maybe not) would be cancelled out and the rest of the circuit would be intact.

So I calculated Rth based on the rest...

(40kΩ+10kΩ)||50kΩ=25kΩ

Can someone explain what I did wrong?

I also tried doing

(10kΩ+50kΩ)||20kΩ+5kΩ which gave me an answer of 20kΩ but I do not think I can add the 5kΩ resistor to the 20kΩ resistor in that order.