Answer
4
Work Step by Step
z= x^{2}+3y^2
y=1
Thus
x^{2}+3(1)^2 [putting the value of y]
z=x^2+3
Differentiating,
d(z)/dx=2x
Thus at (2,1,7)
dz/dx= (2*2)=4
Calculus, 10th Edition (Anton)
by Anton, Howard
Published by
Wiley
ISBN 10:
0-47064-772-8
ISBN 13:
978-0-47064-772-1
Chapter 13 - Partial Derivatives - 13.3 Partial Derivatives - Exercises Set 13.3 - Page 938: 55
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