How Do You Solve This Bernoulli Differential Equation?

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Discussion Overview

The discussion revolves around solving Bernoulli differential equations, specifically focusing on a given equation and the steps involved in finding its solution. Participants share their approaches and seek clarification on specific steps in the solution process.

Discussion Character

  • Technical explanation
  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a Bernoulli differential equation and requests full solution steps, indicating they believe they have made a mistake.
  • Another participant shares a related equation and expresses difficulty in finding a derivative, prompting further clarification.
  • A participant attempts to clarify the derivative issue by rewriting the equation and showing their method for solving it, but later acknowledges a typo that affects their previous message.
  • There is a correction regarding the form of the equation, which leads to a reevaluation of the solution method discussed earlier.

Areas of Agreement / Disagreement

The discussion contains multiple competing views and approaches to solving the equations presented. There is no consensus on the correct solution steps, and participants are actively clarifying and correcting each other's contributions.

Contextual Notes

Participants express uncertainty about specific steps in the solution process, and there are noted typos that affect the clarity of the equations being discussed. The discussion reflects a reliance on the correct formulation of the equations for accurate solutions.

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[tex]\frac{dy}{dx} - \frac{1}{x}*y + \frac{1}{y^2}*x = 0[/tex]

This is a bernoulli differential equation which follows the following procedure
http://en.wikipedia.org/wiki/Bernoulli_differential_equation
Can someone provide the full steps because somewhere I am mistaken?
 
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See attachment :
 

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Thank you a lot. One more question:
In ODE I reach in a place where i have that
[tex]\frac{dz}{dx}*x^3- 3x^2*z + 3x^4 = 0[/tex]

I cannot find the derivatve on that
 
Last edited:
I cannot find the derivatve on that
I cannot understand what you mean : The derivative of what function ?
Well, the equation is
x(dz/dx)-3xz = -3x²
So , solving x(dZ/dx)-3x = 0 leads to Z = C*(x^3)
Remplace C by f(x)
then z = f(x)*(x^3)
dz/dx = (x^3)*(df/dx) +3*x² f
x( (x^3)*(df/dx) +3*x² f ) -3x (x^3)*f = -3x²
(x^4)*(df/dx) = -3x²
df/dx = -3/x²
f = (3/x) + C
z = 3 x² + C (x^3)
 
x(dz/dx)-3xz = -3x²
how did you find that?
 
Sorry, there was a typo. The correct equation is
x(dz/dx) - 3z = -3x²
and there was other typo in my message #4.
As a consequence, my message #4 is wrong.
Nevertheless, it shows the method to solve this kind of equations.
 

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