The critical points of f (x, y,z) = x y + 2x z + 2yz subject to the constraint that xyz
Chapter 4, Problem 27(choose chapter or problem)
The critical points of f (x, y,z) = x y + 2x z + 2yz subject to the constraint that xyz = 4 are the same as the critical points of the function F(x, y) = x y + 8 x + 8 y
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