Answer
See image.
.
Work Step by Step
Equate $f(x,y)=c$
for each value of c
For c=0,
$ x^{2}+y^{2}=0\qquad$ is the origin.
For the other values of c:
we have circles about the origin with radii $1,2,3,4,5$
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
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: 14
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