Finding Maximum Value of f(x,y,z) on Ellipsoid x^2+2y^2+3z^2=1

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The discussion focuses on maximizing the function f(x,y,z) = x + y + z subject to the constraint of the ellipsoid defined by x² + 2y² + 3z² = 1. Participants explore the possibility of solving this optimization problem without employing Lagrange multipliers. One suggested approach involves expressing x in terms of y and z, allowing for the maximization of the resulting function. The conversation highlights alternative methods to tackle constrained optimization problems in multivariable calculus.

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  • Understanding of multivariable calculus concepts
  • Familiarity with ellipsoidal equations
  • Knowledge of optimization techniques
  • Basic skills in algebraic manipulation
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  • Study the method of Lagrange multipliers for constrained optimization
  • Explore alternative optimization techniques in multivariable calculus
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Homework Statement


Find the maximum value of f(x,y,z)=x+y+z on the ellipsoid x^2+2y^2+3z^2=1

2. The attempt at a solution
Is it possible to find the maximum value without using Lagrange multiplier?

Thanks
 
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You could solve
x^2+ 2y^2+3z^2= 1
for, say,
x=\pm\sqrt{1- 2y^2- 3z^2}
and then maximize
\sqrt{1- 2x^2- 3y^2}+ y+ z and
-\sqrt{1- 2y^2- 3y^2}+ y+ z
 

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