Answer
$$6,\quad -\frac{1}{6}$$
Work Step by Step
Since $ h(x,y,z)=xyz^{-2}$, then
$$ h(3,8,2)=(3)(8)(2)^{-2}=\frac{24}{4}=6$$
$$ h(3,-2,-6)=(3)(-2)(-6)^{-2}=\frac{-6}{36}=-\frac{1}{6}$$
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 - 15.1 Functions of Two or More Variables - Exercises - Page 763: 3
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