With the shape given by equation $Az = Bx^m + Cy^n − Dx − Ey + 14$ where $x$, $y$, and $z$ are measured in meters. If you are standing at location $(10, 30, 40)$, by performing second derivatives test, identify $A$, $B$, $C$, $D$, $E$, $m$ and $n$ such that $(10, 30, 40)$ is local maximum.
May I know how to identify all those constants?