Finding Max and Min with Lagrange Multipliers: Homework Help

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SUMMARY

The discussion focuses on finding the maximum and minimum values of the function f(x,y) = x²y under the constraint x² + y² = 1 using the method of Lagrange multipliers. The user identified four critical points: (±√(2/3), ±√(1/3)). Additionally, it is essential to evaluate the boundary points (-1, 0), (1, 0), (0, 1), and (0, -1) to ensure all potential extrema are considered. The discussion also highlights a common formatting issue with LaTeX in forum posts.

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Homework Statement



find the max and min of f(x,y)=x^2y, constraint x^2+y^2=1

Homework Equations



None.

The Attempt at a Solution



I found that possible points use the procedure of the method of lagrange multiplier, I got [tex](\pm\sqrt{2/3}, \pm\sqrt{1/3}[/tex] so 4 points total.
But do I have to check the end point on the constraint? like points (-1, 0), (1, 0), (0, 1), (0, -1)?and y this latex thing won't work? help please. lol
 
Last edited:
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You should check the boundaries because for 1) they could have max or min depending contexts and 2) they will give you some sanity towards the answer you have.
 
Change the direction of the slash on your closing tex tag. [\tex] sould be [ /tex] (witout the space obviously)
 

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