From the point (2,2), find the directions in which the directional derivative of f(x,y)=x2 +xy3 takes the value of 12.
From the point (2,2), find the directions in which the directional derivative of f(x,y)=x2 +xy3 takes the value of 12.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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From the point (2,2), find the directions in which the directional derivative of f(x,y)=x2 +xy3 takes the value of 12.
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Step 1
Given
we have to find the directions in which the directional derivative of function takes the value of 12 from the point (2, 2)
We know that the the directional derivative in the direction of unit vector at angle is
(1)
where is the gradient of .
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