Concept
Version 6
Created by Boundless
Applications of Minima and Maxima in Functions of Two Variables
Plot of $z = (x+y)(xy+xy^2)$
The maxima and minima of this plot cannot be found without extensive calculation.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Second partial derivative test."
http://en.wikipedia.org/wiki/Second_partial_derivative_test
Wikipedia
CC BY.