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
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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 f(x, y)=x2+xy3

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 u at angle θ is

Duf(x, y)=f·u   (1)

where f is the gradient of f.

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