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La $f(x,y)=-x^2+xy-y^2-9y+6x$

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$f_x=$ [[0]] =0                          

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                                                                                             $\\Rightarrow$ $\\mathbf{a}=$ ([[2]],[[3]]) er et kritisk punkt

\n

$f_y=$ [[1]] =0

\n

\n

\n

$f_{xx}=$ [[4]]

\n

$f_{xy}=$ [[5]]

\n

$f_{yy}=$ [[6]]

\n

$A=f_{xx}(\\mathbf{a})$ = [[4]],  $B=f_{xy}(\\mathbf{a})$ = [[5]], $C=f_{yy}(\\mathbf{a})$ = [[6]],  $AC-B^2$= [[7]]

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Da $\\mathbf{a}$ er

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