Maximizing Volume: Rectangular Box Inscribed in an Ellipsoid

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SUMMARY

The discussion focuses on maximizing the volume of a rectangular box inscribed within the ellipsoid defined by the equation (x^2/a^2) + (y^2/b^2) + (z^2/c^2) = 1. The volume of the box is expressed as V = x * y * z, and the solution involves rewriting x in terms of y and z to apply critical point analysis. The key takeaway is that the maximum volume occurs when the dimensions of the box are optimized based on the constraints of the ellipsoid.

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  • Understanding of ellipsoids and their equations
  • Knowledge of multivariable calculus, specifically critical point analysis
  • Familiarity with optimization techniques for functions of multiple variables
  • Ability to manipulate algebraic expressions to express variables in terms of others
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  • Learn about the properties of ellipsoids and their geometric implications
  • Explore techniques for finding maxima and minima of functions of two variables
  • Investigate applications of optimization in real-world scenarios, such as engineering and architecture
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Students in calculus or optimization courses, mathematicians, engineers, and anyone interested in geometric optimization problems.

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Homework Statement


Find the volume of the largest rectangular box with faces parallel to the coordinate planes that can be inscribed inside the ellipsoid :

(x^2/a^2)+(y^2/b^2)+(z^2/c^2) = 1


Homework Equations



Volume of a rectangular box = x * y * z
critical point formula.

The Attempt at a Solution



The volume of a box is maximised when x = y = z ?
 
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Not quite. Try rewriting x in terms of y and z and plugging this into your volume formula. This must hold since x is determined by y and z (i.e. the vertices of the rectangular box will lie on the ellipsoid.)

Now, how do you find the maximum of a function of one variable? How do you find the maximum of a function of two variables?
 

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