Simple multivariable problem w/ ellipse

In summary, a multivariable problem with an ellipse involves finding the relationship between two or more variables within a given elliptical shape. This type of problem often requires solving for multiple unknown values. An ellipse is defined as a closed, curved shape that is formed by the intersection of a cone and a plane, where the plane is at an angle to the base of the cone. In a multivariable problem, the ellipse is typically represented by an equation that relates the variables involved. The common variables involved in a simple multivariable problem with an ellipse are usually the coordinates of points on the ellipse, such as the x and y coordinates. Other variables may include the semi-major and semi-minor axes, the center point of the ellipse,
  • #1
MeMoses
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Homework Statement



If u=x^3 + 3xy + y^3, determine du/dx on the ellipse 2x^2+3y^2=1

2. The attempt at a solution

Imagine I just use partial derivative somehow, but I'm not sure what the question is asking by on the ellipse. I have a feeling its just something simple that I'm overlooking. Any help is appreciated. Thanks
 
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  • #2
The chain rule:
[tex]\frac{du}{dx}= \frac{\partial u}{\partial x}+ \frac{\partial u}{\partial y}\frac{dy}{dx}[/tex]
You get dy/dx from the requirement that [itex]2x^2+ 3y^2= 1[/itex], of course.
 

1. What is a multivariable problem with an ellipse?

A multivariable problem with an ellipse involves finding the relationship between two or more variables within a given elliptical shape. This type of problem often requires solving for multiple unknown values.

2. How is an ellipse defined in a multivariable problem?

An ellipse is defined as a closed, curved shape that is formed by the intersection of a cone and a plane, where the plane is at an angle to the base of the cone. In a multivariable problem, the ellipse is typically represented by an equation that relates the variables involved.

3. What are the common variables involved in a simple multivariable problem with an ellipse?

The common variables involved in a simple multivariable problem with an ellipse are usually the coordinates of points on the ellipse, such as the x and y coordinates. Other variables may include the semi-major and semi-minor axes, the center point of the ellipse, and the eccentricity.

4. How do you solve a simple multivariable problem with an ellipse?

To solve a simple multivariable problem with an ellipse, you can use algebraic methods such as substitution and elimination to manipulate the given equations and solve for the unknown variables. Graphical methods can also be used by plotting the ellipse and finding the intersecting points with other lines or curves.

5. What are some real-life applications of simple multivariable problems with ellipses?

Simple multivariable problems with ellipses have various real-life applications, such as predicting the orbits of planets and satellites, analyzing the shapes of celestial bodies, and designing curved structures in architecture and engineering. They are also used in fields such as physics, economics, and statistics to model complex relationships between variables.

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