Originally Posted by

**SolicShooter**
I think your question is answered, so if you don't me hijacking your topic. How do you exactly determine if the critical points you find are a maximum or a minimum. I now have a solution to a problem, by using the langrange method, expressed through a few other symbols like this for example: x* = 3m / (3px + 2py), y* = 2m / (3px + 2py), where m is income, px is price of good x and py is price of good y. The question was to find the maximum, but how can I determine if this solution is the maximum?

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