Eliminating Arbitrary Constants: Solving the Differential Equation

In summary, the conversation is about solving a differential equation by eliminating an arbitrary constant from the given equation. The steps shown in the image are not the correct method and the correct method is to differentiate through by x. The final differential equation is (y-b)dy/dx=2 and it is not clear what the next step should be as the full problem statement is not provided.
  • #1
manal950
177
0

Homework Statement



From the differential equation by eliminating the arbitrary constant from the equation
(y - b ) ^2 = 4 (X-a )

http://www7.0zz0.com/2013/02/02/21/747681463.png
 
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  • #2


What do you want to do?
The first equation is not a differential equation, and can be solved for y (or x) easily (not with the steps shown in the image).
 
  • #3


Probably means form the differential equation.

Well, just differentiate through by x.
 
  • #4


(y- b ) ^2 = 4 (X- a )

2(y-b)dy/dx = 4 (divide by 2 )

(y-b)dy/dx= 2

then what should I do
 
  • #5


manal950 said:
(y- b ) ^2 = 4 (X- a )

2(y-b)dy/dx = 4 (divide by 2 )

(y-b)dy/dx= 2

then what should I do

I don't know what you are trying to do. Yes, (y-b)dy/dx=2. So dy/dx=2/(y-b). If that's what you want to do you are done. You now have a differential equation for y without the initial condition constant.
 
Last edited:
  • #6


yes now

dy/dx=2/(y-b)

but after that what must I do ?

( 2/dy/dx )^2 = 4(X-a )
 
  • #7


Post the full problem statement please.
We have no idea what you want/have to do, as it is your homework and not ours.
 
  • #8


You have formed a differential equation by eliminating an arbitrary constant. That seems to be what you were asked but as Dick says, we have had to guess a bit.
 

FAQ: Eliminating Arbitrary Constants: Solving the Differential Equation

What is the differential equation method used for eliminating arbitrary constants?

The differential equation method is a mathematical technique used to solve equations that involve derivatives. It is commonly used to eliminate arbitrary constants from a given equation, which allows for a unique solution to be found.

How does the differential equation method work?

The differential equation method involves taking the derivative of a given equation multiple times until all arbitrary constants are eliminated. This is achieved by using various rules and techniques, such as separation of variables, substitution, and integration.

Why is it important to eliminate arbitrary constants?

Eliminating arbitrary constants allows for a unique solution to be found for a given equation. Without eliminating these constants, there would be an infinite number of possible solutions, making it difficult to accurately model and understand the underlying system.

Can the differential equation method be used for all types of equations?

The differential equation method is most commonly used for solving differential equations, which involve derivatives. However, it can also be applied to other types of equations, such as algebraic equations, as long as they can be written in a differential form.

Are there any limitations to using the differential equation method?

While the differential equation method is a powerful tool, it does have some limitations. It may not be able to find a solution for every type of equation, and it can be quite complex and time-consuming for more complicated equations. Additionally, it may require some creativity and intuition to determine the appropriate steps to eliminate arbitrary constants.

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