Euler's rule or Non-homogenous method?

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In summary, the conversation discusses how to solve the equation x^2 y' + xy + 5x^5=0 using Euler's equations and non-homogeneous methods. It is suggested to divide by x and then integrate both terms to find the solution. Another suggestion is to rewrite the equation in the form y' + y*(1/x) = -5x^3 and use an integrating factor of x to continue solving the equation. It is noted that both methods yield the same solution.
  • #1
lost_math
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Homework Statement


x^2 y' + xy + 5x^5=0

Homework Equations


no starting conditions


The Attempt at a Solution


cannot figure out how to do this. Euler's equations methods have no pure x terms, and the non-homogenous methods have some kind of separable thing, where the x terms neatly land up on RHs and y terms on LHS. But what do i do with this? Is it the polynomial expansion or maybe some kind of taylor series?
 
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  • #2
U can divide by "x" (assuming x different from 0) and then write the resulting eqn as

[tex] (xy)'=-5x^{4} [/tex]

Integrate both terms and then see what you get.

Daniel.
 
  • #3
I think dextercioby missed a term.

Start by putting in the form y' + y*(1/x) = -5x^3

Next, your integrating factor is p = e^[integral(1/x)dx] = e^(lnx) = x

Continue...
 
  • #4
Stevecgz said:
I think dextercioby missed a term.

Start by putting in the form y' + y*(1/x) = -5x^3

Next, your integrating factor is p = e^[integral(1/x)dx] = e^(lnx) = x

Continue...

He didn't miss a term, your solution and his are identical, yours is just more detailed.
 
  • #5
d_leet said:
He didn't miss a term, your solution and his are identical, yours is just more detailed.

Right :smile:
 
  • #6
Thanks all, was really helpful.
 

1. What is Euler's rule or Non-homogenous method?

Euler's rule, also known as the non-homogenous method, is a mathematical technique used to solve differential equations. It involves finding a general solution to a differential equation by breaking it down into smaller, more manageable parts.

2. How does Euler's rule work?

Euler's rule works by first finding a particular solution to a differential equation, and then adding it to the general solution of the corresponding homogeneous equation. This allows for a complete solution to the given differential equation.

3. When is Euler's rule used?

Euler's rule is most commonly used when solving linear, non-homogenous differential equations with constant coefficients. It is also useful when solving initial value problems.

4. What is the difference between Euler's rule and the homogeneous method?

The main difference between Euler's rule and the homogeneous method is that Euler's rule allows for the addition of a particular solution to the general solution of a differential equation, while the homogeneous method only provides a general solution without a particular solution.

5. Are there any limitations to using Euler's rule?

Euler's rule can only be used to solve linear, non-homogenous differential equations with constant coefficients. It also may not work for more complex or nonlinear equations. Additionally, care must be taken to ensure that the particular solution chosen is a valid solution to the original differential equation.

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