Consider maximising 10 - x2 - 4y2 + 2xy where where x > 12. What y-value solves this maximisation problem?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 17EQ
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Consider maximising 10 - x2 - 4y2 + 2xy where where x > 12. What y-value solves
this maximisation problem?
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First, write the Lagrangian. Remember to rewrite the inequality constraint in the form
0 ... beforehand. You should get two first order conditions as usual from it: Ly = 0
and Ly = 0.
For the third equation, using the complementary slackness condition. There are two
cases:
1. constraint holds with strict equality and the multiplier is non-negative
2. constraint holds with strict inequality and the multiplier is zero
Each case should come with one equation and one check to perform on the potential
critical points. Find all potential critical points in every case. If there is more than one
critical point, then compare them to find the maximum.
Transcribed Image Text:Consider maximising 10 - x2 - 4y2 + 2xy where where x > 12. What y-value solves this maximisation problem? Your Answer: Answer Hide hint for Question 1 First, write the Lagrangian. Remember to rewrite the inequality constraint in the form 0 ... beforehand. You should get two first order conditions as usual from it: Ly = 0 and Ly = 0. For the third equation, using the complementary slackness condition. There are two cases: 1. constraint holds with strict equality and the multiplier is non-negative 2. constraint holds with strict inequality and the multiplier is zero Each case should come with one equation and one check to perform on the potential critical points. Find all potential critical points in every case. If there is more than one critical point, then compare them to find the maximum.
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