# Level Surfaces and Quadratic Surfaces

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Let , , and be nonzero constants. We plot level surfaces for quadratic functions in three variables, which give some well-known quadratic surfaces:

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Contributed by: Ana Moura Santos and João Pedro Pargana (Instituto Superior Técnico) (March 2011)

Open content licensed under CC BY-NC-SA

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"Level Surfaces and Quadratic Surfaces"

http://demonstrations.wolfram.com/LevelSurfacesAndQuadraticSurfaces/

Wolfram Demonstrations Project

Published: March 7 2011