Can Non-Linear Separable Differential Equations Be Solved?

Click For Summary
SUMMARY

The discussion focuses on solving the non-linear separable differential equation \(\frac{dy}{dx}+2xy^{2}=0\). The solution involves recognizing the equation as separable, allowing for the separation of variables. The final solution is derived as \(y=\frac{1}{x^{2}+C_{1}}\). Participants confirm the method of separation and express their struggles with advanced calculus concepts.

PREREQUISITES
  • Understanding of differential equations, specifically non-linear and separable types.
  • Familiarity with integration techniques, particularly for rational functions.
  • Knowledge of calculus concepts, including derivatives and integrals.
  • Experience with exact equations and their solutions.
NEXT STEPS
  • Study the method of separation of variables in differential equations.
  • Learn advanced integration techniques, focusing on rational functions.
  • Explore non-linear differential equations and their classifications.
  • Review exact equations and their properties for better problem-solving skills.
USEFUL FOR

Students and professionals studying differential equations, particularly those struggling with non-linear separable equations, as well as educators looking for teaching strategies in advanced calculus.

EtherealMonkey
Messages
41
Reaction score
0

Homework Statement



\frac{dy}{dx}+2xy^{2}=0

I am stuck on this.

I realize that this is a non-linear exact equation, but I just cannot wrap my mind around any type of method to attack this one.

TIA for any help
 
Physics news on Phys.org
You noticed it is separable, so just separate the variables.
 
Okay, never-mind...

Problem:

\frac{dy}{dx}+2xy^{2}=0

Solution:

\frac{dy}{dx}=-\left(2xy^{2}\right)

\left(\frac{1}{y^{2}}\right)\frac{dy}{dx}=-2x

\int\frac{1}{y^{2}} dy=-2\int x dx

y=\frac{1}{x^{2}+C_{1}}
 
LCKurtz said:
You noticed it is separable, so just separate the variables.

Yeah, my CalIII is killing me...

Thanks for the response. I hope the next time I have a question, it will be a good one :redface:
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

Similar threads

Replies
2
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
1
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
2
Views
1K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 5 ·
Replies
5
Views
1K