MHB Solving Differential Equations

Thread starter hossam killua
Start date Nov 7, 2014
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Chain Chain rule

Nov 7, 2014

hossam killua

by chain rule or by homegenious function idk how to start with chain rule or uing homoginus function

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Nov 7, 2014

hossam killua

i can't get fxx or fyy

Thread 'How to Find Critical Points of function f(x,y,z)'

Hi everybody If we have not any answers for critical points after first partial derivatives equal to zero, how can we continue to find local MAX, local MIN and Saddle point?. For example: Suppose we have below equations for first partial derivatives: ∂ƒ/∂x = y + 5 , ∂ƒ/∂y = 2z , ∂ƒ/∂z = y As you can see, for ∇ƒ= 0 , there are not any answers (undefined)

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