Consider f(x, y) = x2 + 4.xy + y? subject to the constraint x2 + y? < 49 (a) Find all critical points of the function that lie in the interior of the disk and use the second derivative test to classify those points. (b) Using Lagrange multipliers, determine the complete system of equations to find the points on the boundary.

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter12: Algebra Of Matrices
Section12.CR: Review Problem Set
Problem 35CR: Maximize the function fx,y=7x+5y in the region determined by the constraints of Problem 34.
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4. Consider f(x, y) = x² + 4xy + y² subject to the constraint x2 + y? < 49
(a) Find all critical points of the function that lie in the interior of the disk and use the second
derivative test to classify those points.
(b) Using Lagrange multipliers, determine the complete system of equations to find the points
on the boundary.
(c) Solve the system and provide the point(s) on the boundary where f is optimized. Make sure
you consider the case when x = 0 and when y = 0.
(d) Which of those points maximizes f?
(e) Which of those points minimizes f?
Transcribed Image Text:4. Consider f(x, y) = x² + 4xy + y² subject to the constraint x2 + y? < 49 (a) Find all critical points of the function that lie in the interior of the disk and use the second derivative test to classify those points. (b) Using Lagrange multipliers, determine the complete system of equations to find the points on the boundary. (c) Solve the system and provide the point(s) on the boundary where f is optimized. Make sure you consider the case when x = 0 and when y = 0. (d) Which of those points maximizes f? (e) Which of those points minimizes f?
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