Find two unit vectors u such that Duf(1, 1) Here, f(x, y) = x² +9y². NOTE: you must enter your FIRST answer as the vector whose x compo- nent is NEGATIVE and your second answer as the vector whose x component is positive! and (05 u = -0.05 Y -0.99 0.99

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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This is a practice problem from my Multivariable Calculus course:

Find two unit vectors u such that Duf(1, 1) = 0. Here, f(x, y) = x² +9y².
NOTE: you must enter your FIRST answer as the vector whose x compo-
nent is NEGATIVE and your second answer as the vector whose x component
is positive!
(
u=
-0.05
I
-0.99
X
) and
(
0.05
X
0.99
X
>
Transcribed Image Text:Find two unit vectors u such that Duf(1, 1) = 0. Here, f(x, y) = x² +9y². NOTE: you must enter your FIRST answer as the vector whose x compo- nent is NEGATIVE and your second answer as the vector whose x component is positive! ( u= -0.05 I -0.99 X ) and ( 0.05 X 0.99 X >
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