Solving a homogeneous first-order ordinary differential eqn

In summary, a homogeneous first-order ordinary differential equation is an equation that relates an unknown function to its first derivative, and can be written in the form y' = f(x,y). To solve it, you can use the method of separation of variables and the resulting equation can be solved for the unknown function. The general solution is a family of functions that can have arbitrary constants, which can be determined by applying initial conditions. To check if a solution is valid, you can substitute it into the original equation and take its derivative. A homogeneous first-order ordinary differential equation can have multiple solutions, but each solution must satisfy the original equation and any initial conditions given.
  • #1
Aceix
49
1

Homework Statement


dy/dx = (x+4y)2

Homework Equations

The Attempt at a Solution


I substitute y=ux, where u is a function of x, and I'm not a ble to solve. My intention was to arrive at a seperable form, but I'm not achieving it.[/B]
 
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  • #2
Try the substitution u=x+4y.
 
  • #3
@Aceix Your problem is assuming your DE is homogeneous. Homogeneous in this sense means ##f(tx,ty) = f(x,y)##. That does't work for ##f(x,y)=(x-4y)^2##.
 
  • #4
Thanks a lot! I've got it now.
 

Related to Solving a homogeneous first-order ordinary differential eqn

1. What is a homogeneous first-order ordinary differential equation?

A homogeneous first-order ordinary differential equation is a mathematical equation that relates an unknown function to its first derivative, where all terms in the equation have the same degree. In other words, the equation can be written in the form y' = f(x,y), where y' is the first derivative of y with respect to x and f(x,y) is a function of both x and y.

2. How do you solve a homogeneous first-order ordinary differential equation?

To solve a homogeneous first-order ordinary differential equation, you can use the method of separation of variables. This involves isolating the variables on opposite sides of the equation and then integrating both sides with respect to the appropriate variable. The resulting equation can be solved for the unknown function.

3. What is the general solution to a homogeneous first-order ordinary differential equation?

The general solution to a homogeneous first-order ordinary differential equation is a family of functions that satisfy the equation. It typically contains one or more arbitrary constants, which can be determined by applying initial conditions to the equation.

4. How do you check if a solution to a homogeneous first-order ordinary differential equation is valid?

To check if a solution to a homogeneous first-order ordinary differential equation is valid, you can substitute the solution into the original equation and see if it satisfies the equation for all values of x. Additionally, you can take the derivative of the solution and see if it matches the original equation.

5. Can a homogeneous first-order ordinary differential equation have multiple solutions?

Yes, a homogeneous first-order ordinary differential equation can have multiple solutions. This is because the general solution contains arbitrary constants, allowing for an infinite number of possible solutions. However, each solution must satisfy the original equation and any initial conditions given.

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