Homogeneous differential equation - serious help

In summary, the student attempted to solve the homework equation by using the property of v=y/x, but made a mistake which caused the equation to become incorrect. After fixing the mistake, the student was able to correctly solve the equation using the property of v=y/x.
  • #1
masterchiefo
212
2

Homework Statement


I need to resolve this with v = y/x

dy/dx= (3y2-x2)/(2xy)

Homework Equations

The Attempt at a Solution


dy/dx= (3y2-x2)/(2xy)

dy/dx= 3y2/2xy -x2/2xy

dy/dx = 3y/2x -x/2y

dy/dx = 3y/2x - 1/2y/x

dy/dx = 3/2 *v - 1/2*v

F(v) = 3/2 *v - 1/2*v

is that good so far ?
 
Last edited:
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  • #2
The First term in your 2nd line is wrong, and the error propagates through from there.
 
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Likes masterchiefo
  • #3
andrewkirk said:
The First term in your 2nd line is wrong, and the error propagates through from there.
sorry I made a mistake in the original equation and now its fixed.
it was 3y3 but its actually 3y2
 
  • #4
You've expressed the right-hand side in terms of v, so that's progress. Now you need to do similar work on the left hand side.

Using ##v=\frac{y}{x}##, express ##\frac{dv}{dx}## in terms of y, y' and x, then see if you can use that to express y' in terms of v, v' and x. Equate that to the RHS and then with any luck you'll be able to use separation of variables to get an expression to be integrated over x on one side and the same for v on the other.
 
  • #5
andrewkirk said:
You've expressed the right-hand side in terms of v, so that's progress. Now you need to do similar work on the left hand side.

Using ##v=\frac{y}{x}##, express ##\frac{dv}{dx}## in terms of y, y' and x, then see if you can use that to express y' in terms of v, v' and x. Equate that to the RHS and then with any luck you'll be able to use separation of variables to get an expression to be integrated over x on one side and the same for v on the other.
what do you mean by left hand side ?
 
  • #6
LHS of the diff equation in section 1 of your OP, which is: ##\frac{dy}{dx}##.
 
  • #7
andrewkirk said:
LHS of the diff equation in section 1 of your OP, which is: ##\frac{dy}{dx}##.
hey man, thanks for your time and help, I was able to get it resolved and it matched the answer in my book.
you are awesome.
 
  • #8
Please do NOT erase the original problem after it has been solved. Other people can learn from this.
 

Related to Homogeneous differential equation - serious help

1. What is a homogeneous differential equation?

A homogeneous differential equation is a type of differential equation where all the terms are of the same degree. This means that the dependent variable and its derivatives are the only variables present in the equation. The general form of a homogeneous differential equation is dy/dx = f(x,y).

2. What is the difference between a homogeneous and non-homogeneous differential equation?

The main difference between a homogeneous and non-homogeneous differential equation is the presence of a constant term. In a homogeneous equation, there are no constant terms, while in a non-homogeneous equation, there is at least one constant term present. This constant term affects the solution of the equation and makes it more complicated to solve.

3. How do I solve a homogeneous differential equation?

To solve a homogeneous differential equation, you can use the method of separation of variables, substitution, or integrating factors. The specific method used will depend on the form of the equation and the techniques you are familiar with. It is important to note that not all homogeneous differential equations can be solved analytically, and in some cases, numerical methods may be required.

4. What is the significance of homogeneous differential equations in science?

Homogeneous differential equations are widely used in various fields of science, including physics, chemistry, and engineering. They are used to model and describe many natural phenomena, such as population growth, chemical reactions, and motion of objects. Solving these equations helps us understand and predict the behavior of systems in the natural world.

5. Is there any real-life application of homogeneous differential equations?

Yes, there are many real-life applications of homogeneous differential equations. They are used in various fields of science and engineering to model and solve problems, such as in circuit analysis, heat transfer, and fluid mechanics. They are also used in economics and biology to study population dynamics and growth. Homogeneous differential equations are an essential tool in understanding and analyzing complex systems in the real world.

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