Answer
See the explanation below.
Work Step by Step
The differentials of the function $z=f(x,y)$ is differentiable and continuous at the point $(a,b)$ .It can be defined as:
$dz=f_x(x,y)dx+f_y(x,y)dy$
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 14 - Partial Derivatives - Review - Concept Check - Page 1021: 10
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