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I am quite new, how can I find minumum, maximum or saddle point the following multivariable function by using mathematica $f(x,y)= 2x^3 +6xy^2 −3y^3 −150x$

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closed as off-topic by Michael E2, MarcoB, yohbs, m_goldberg, zhk Mar 22 '17 at 3:20

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  • $\begingroup$ Isn't you $x$ derivative always positive? so no min/max/saddle? $\endgroup$ – BlacKow Mar 21 '17 at 22:12
  • $\begingroup$ Thank you for your interest. I updated the question. $\endgroup$ – HD239 Mar 21 '17 at 22:22
  • $\begingroup$ Saddle Points and Inflection Points: Wolfram Demonstrations Project; and using Minimize and Maximize shows that your exemplary function does not have a min/max. $\endgroup$ – corey979 Mar 21 '17 at 22:34
  • $\begingroup$ Is it Mathematica software question or general math question? $\endgroup$ – BlacKow Mar 21 '17 at 22:44
  • $\begingroup$ See the "Applications" section of the docs for Grad. $\endgroup$ – Michael E2 Mar 21 '17 at 22:48