Answer
See the explanation below.
Work Step by Step
The differentials of the function $z=f(x,y)$ are differentiable and continuous at the point $(a,b)$ and defined as:
$dz=f_x(x,y)dx+f_y(x,y)dy$
Multivariable Calculus, 7th Edition
by Stewart, James
Published by
Brooks Cole
ISBN 10:
0-53849-787-4
ISBN 13:
978-0-53849-787-9
Chapter 14 - Partial Derivatives - Review - Concept Check - Page 991: 10
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