Find the local max/min values and saddle points: taking the partial derivatives I get taking: if I make the replacement I get: is this correct?
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Originally Posted by lllll Find the local max/min values and saddle points: taking the partial derivatives I get taking: if I make the replacement I get: is this correct? You're hoeing the hard road. .... (1) .... (2) (1) - (2): . Case 1: y = x Substitute into (1): . No real solution. Case 2: y = -x Substitute into (1): . Extremum solutions are (1, -1) and (-1, 1). Now you have to test their nature.
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