Answer
$$ f_z(2,3,1)=6.$$
Work Step by Step
Since $ f(x,y,z)=xyz $, then we have
$$ f_z(x,y,z)=xy \Longrightarrow f_z(2,3,1)=2(3)=6.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.3 Partial Derivatives - Exercises - Page 780: 5
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