Solving a homogeneous first-order ordinary differential eqn

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SUMMARY

The discussion focuses on solving the homogeneous first-order ordinary differential equation (ODE) given by dy/dx = (x + 4y)². The initial approach involved substituting y = ux to achieve a separable form, but this was unsuccessful. A key insight provided by a participant clarified that the equation is not homogeneous in the traditional sense, as it does not satisfy the condition f(tx, ty) = f(x, y). This correction enabled the original poster to progress in their understanding of the problem.

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Aceix
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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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Try the substitution u=x+4y.
 
@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##.
 
Thanks a lot! I've got it now.
 

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