Op-Amp Circuit Analysis: Troubleshooting Incorrect Node Usage

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SUMMARY

The discussion centers on troubleshooting an op-amp circuit analysis where the user encounters discrepancies in voltage output (Vo) when using different node configurations. Specifically, using nodes V1 and V2 yields a correct output of Vo = -2.5V, while using nodes V1 and Vo results in an incorrect answer. The conversation emphasizes the importance of correctly accounting for all currents entering node Vo and suggests that clarity in the equations used is crucial for accurate analysis.

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paulmdrdo
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In the problem below, when I use nodes V1 and V2 I get the correct answer of Vo = -2.5v
But when I use nodes V1 and Vo I get an incorrect answer. Please explain to me why my latter method did not work.
Thanks.

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Do you have all the currents going into node Vo?
 
I'd be happy to help if I could read your writing and if you showed where your equations come from.
 

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