In http://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/2.-partial-derivatives/part-c-lagrange-multipliers-and-constrained-differentials/session-42-constrained-differentials/MIT18_02SC_pb_42_comb.pdf

problem number 3, why the variable z is set to 0
even though in the constraint equation the variable z is not included ?

Question

In  http://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/2.-partial-derivatives/part-c-lagrange-multipliers-and-constrained-differentials/session-42-constrained-differentials/MIT18_02SC_pb_42_comb.pdf

problem number 3, why the variable z is set to 0 
even though in the constraint equation the variable z is not included ?

irishboy123 · Answer

i wonder.

have you got to the bottom of this?

phi · Answer

No idea.

unknownunknown · Answer

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