The function f(x,y) = 4xy has an absolute maximum value and absolute minimum value subject to the constraint 3x² + 3y² - 5xy = 121. Use Lagrange multipliers to find these values.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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I have:

Gradient of f = < 4y,4x >
Gradient of g = < 6x-5y, 6y-5x >
Constraint is 3x2 + 3y- 5xy - 121 = 0

Then, I have:

4y = lambda (6x - 5y)

4x = lambda (6y-5x)

My question is how do I solve for my x and y values? I have tried dividing both entire equations over each other and I am finding myself continuously solving and solving. I also tried solving individually for the variables and lambda, but I am getting 0 equal to a constant.

The function f(x,y) = 4xy has an absolute maximum value and absolute minimum value subject to the constraint 3x² + 3y² - 5xy = 121. Use Lagrange multipliers to find these values.
Transcribed Image Text:The function f(x,y) = 4xy has an absolute maximum value and absolute minimum value subject to the constraint 3x² + 3y² - 5xy = 121. Use Lagrange multipliers to find these values.
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