Hi,

I need to take the partial derivatives with respect to x,y,z and λ.

Normally I would have no problem going about this however the problem for me is that there aren't single unkowns but only combined ones:

L= 5xz + 4xy + 4yz + xyzλ - 12λ

Couldn't anyone please help me here? Thank you.

P.S. This is part of a lagrange multiplier problem which I am working through.

See the Lagrange post.

Thanks a lot!