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 $1,2,3,4,5$
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 13 - Section 13.1 - Functions of Several Variables - Exercises - Page 682: 14
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