Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 14: Partial Derivatives - Section 14.1 - Functions of Several Variables - Exercises 14.1 - Page 787: 34



Work Step by Step

when we look at the graph of 3D surface in the graph $c$ it has been found that there are one mountain like shape erecting the center of the $xy$-palne which shows that the graph of 2D level curves has oval rings from the origin (0,0) of the $xy$- plane. Hence, the graph is $c$.
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