# Critical Points of multivariable functions

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Determine the critical points of the function:

f(x1, x2) = (2 - x1 - x2)^2 + (1 + x1 + x2 - x1*x2)^2.

Try to decide their nature.

https://brainmass.com/math/graphs-and-functions/critical-points-multivariable-functions-207306

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