Second order differential equation

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SUMMARY

The discussion centers on solving the nonlinear second order differential equation xy' + y = 1/y². The user initially attempts to apply an integrating factor, which is typically used for linear differential equations, leading to confusion regarding the equation's classification. Participants clarify that the equation is nonlinear and suggest exploring methods such as exact, homogeneous, or Bernoulli solutions to find an explicit solution.

PREREQUISITES
  • Understanding of differential equations, specifically second order types.
  • Familiarity with integrating factors and their application in solving linear differential equations.
  • Knowledge of nonlinear differential equations and their solution methods.
  • Concepts of exact, homogeneous, and Bernoulli differential equations.
NEXT STEPS
  • Research methods for solving nonlinear differential equations, focusing on exact equations.
  • Study the characteristics and solution techniques for Bernoulli differential equations.
  • Learn how to identify and solve homogeneous differential equations.
  • Explore the application of integrating factors in the context of linear versus nonlinear differential equations.
USEFUL FOR

Mathematics students, educators, and professionals dealing with differential equations, particularly those interested in nonlinear dynamics and solution methodologies.

jtruth914
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Find a solution to the following second order differential equation
xy'+y=1/y^2

My Attempt:

P= y'= dy/dx

x dy/dx + y = 1/y^2

dy/dx + y/x = 1/xy^2

Integrating Factor = e^∫1/x dx = e^lnx

y e^lnx=∫ (e^lnx)(1/xy^2) dx
 
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I do not see how this equation is second-order. Where is the second derivative of y?

So where are you stuck? What are you doing?

It bothers me a little that you seem to be using an integrating factor on a nonlinear differential equation; typically, multiplying by an integrating factor is something you do when the the DE is linear (this one isn't since you have a y^2 term).

This differential equation is nonlinear, so it must be one of the types that can be solved explicitly (if this is a homework problem). Can it be shown to be exact, homogeneous, or Bernoulli? (Hint: it can.)
 

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