11. Find an equation of the tangent plane to the surface Va+Vy+Vz=4 at the point P(4,1, 1). 12. Find the local mori

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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please answer number 11!
11. Find an equation of the tangent plane to the surface Vr+Vy+Vz =4 at the point P(4,1, 1).
12. Find the local maximum and minimum values and saddle point(s) of the function f(x, y) =
-x4 + 4xy – 2y² + 1.
2 subiect to
13. Find the maximum value of the function f(x,y) = 6 - 47?
Transcribed Image Text:11. Find an equation of the tangent plane to the surface Vr+Vy+Vz =4 at the point P(4,1, 1). 12. Find the local maximum and minimum values and saddle point(s) of the function f(x, y) = -x4 + 4xy – 2y² + 1. 2 subiect to 13. Find the maximum value of the function f(x,y) = 6 - 47?
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