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alirazamarchal Group Title

Find the critical points of the function f(x,y)=x^3-6xy+3y^2-24x+4 Also classify them in Relative Maxima, Relative Minima and Saddle Points.

  • one year ago
  • one year ago

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  1. AlHajri Group Title
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    First find the first partial derivatives (fx) and the first partial derivative (fy). fx= 3x^2-6y-24=0 fy=-6x+6y=0 From these two equations you find the two critical points which are (-2,-2) and (4,4) After that you use the second derivative test (D=fxxfyy-(fxy)^2) In the case of (-2,-2) D<0 and so it is a saddle point. In the case (4,4) D>0 and fxx<0 and so it is a minimum point

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  2. alirazamarchal Group Title
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    Thank you very much...

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