# Partial differential equation

#### dvs77

form the differential equation for the follwing equation
(x^2)/a^2 +(y^2)/b^2+(Z^2)/c^2 =1

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#### Theelectricchild

Just to keep us busy or what?

#### cepheid

Staff Emeritus
Gold Member

Form the differential equation for the following equation:

$$\frac{x^2}{a^2} + \frac{y^2}{b^2} + \frac{z^2}{c^2} = 1$$

I don't get it...how do you get a PDE out of that?

#### dextercioby

Homework Helper
No,find the PDE whose solution is the ellipsoid's implicit equation...

Daniel.

#### cepheid

Staff Emeritus
Gold Member
I see, ok. That wasn't really clear before.

#### dvs77

I mean u get a First order or second order partial differential equation

#### kleinwolf

Well for this last question : suppose you have a 1st order PDE, then just derive again and you get a 2nd order one...

The question is a bit ambigous...let's take a simpler exemple, nonparametric :

y(x)=x^2

Then there are an infinity of differential equation having that solution :

y'=2Sqrt(y)

y''=y'/Sqrt(y)

aso....

Moreover I don't know if you want the parametric equation or the explicit version...(ie. x=x(theta,phi) or x=x(y,z)...)

Just plug in this in your equation and differentiate....