In what direction ữ 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

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 explain how we got the <2i,3j,6k> in step 1 of the solution

Solution.
• We have
2y
+1
(2 + y? – 1
2x
Vf(x,y, 2) = ( ,
i+
a? + у2 — 1
+ 6k.
Thus
Vf(1,1,0) = 27 + 33+ 6k.
The function f is most rapidly increasing in the direction
Vf
1
(27 + 35+ 6k).
|Vf|
7
• The directional derivative of f in the direction u is
df
dt
Transcribed Image Text:Solution. • We have 2y +1 (2 + y? – 1 2x Vf(x,y, 2) = ( , i+ a? + у2 — 1 + 6k. Thus Vf(1,1,0) = 27 + 33+ 6k. The function f is most rapidly increasing in the direction Vf 1 (27 + 35+ 6k). |Vf| 7 • The directional derivative of f in the direction u is df dt
8. Let
f (x, y, z) = ln (x² + y? – 1) + y + 6z.
In what direction i 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?
Transcribed Image Text:8. Let f (x, y, z) = ln (x² + y? – 1) + y + 6z. In what direction i 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?
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