• We have 2x 2y Vf(x, y, z) = i+ +1)j+6k. x² + y²- 1 x² + y? – 1 | Thus Vf(1,1,0) = 27 + 37 + 6K.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Can you show the baby steps of how to get from the circled part to the squared part. lost on how they computed the vector.

8. Let
f(x, y, z) = In (x² + y² – 1) + y + 6z.
In what direction ī is f(x, y, z) increasing most rapidly at the point (1, 1, 0)?
Give your answer as a unit vector ū. What is the directional derivative of f
in the direction u?
Solution.
• We have
2x
2y
Vf(x, y, z) =
(x² + y² – 1
x² + y?
+1)5+6k,
1
Thus
Vf(1,1,0) = 27+ 37+ 6k.
• The function f is most rapidly increasing in the direction
Vf
|Vf|
(27 +33+ 6k) .
• The directional derivative of f in the direction u is
df
= |Vf| = 7.
Transcribed Image Text:8. Let f(x, y, z) = In (x² + y² – 1) + y + 6z. In what direction ī is f(x, y, z) increasing most rapidly at the point (1, 1, 0)? Give your answer as a unit vector ū. What is the directional derivative of f in the direction u? Solution. • We have 2x 2y Vf(x, y, z) = (x² + y² – 1 x² + y? +1)5+6k, 1 Thus Vf(1,1,0) = 27+ 37+ 6k. • The function f is most rapidly increasing in the direction Vf |Vf| (27 +33+ 6k) . • The directional derivative of f in the direction u is df = |Vf| = 7.
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