MediumPartial derivatives

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.1 Surfaces and Level Curves, #27 · Multivariable Calculus · Partial derivatives

The level sets of … look like footballs when … is ______…

The level sets of $F = x^{2} + y^{2} + q z^{2}$ look like footballs when $q$ is ______, like basketballs when $q$ is ______, and like frisbees when $q$ is ______.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.1 Surfaces and Level Curves, #27

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