Solving a Problem I'm Hopeless With: A Hint Needed!

  • Thread starter Misr
  • Start date
In summary, the conversation is about a difficult math problem that the poster is struggling with. They have tried various approaches, including using L'Hopital's Rule and a substitution, but have not been successful. They have also been reminded to show their work and not just ask for the answer. One suggestion is to expand a certain expression, which may lead to the solution.
  • #1
Misr
385
0

Homework Statement


[PLAIN]http://img517.imageshack.us/img517/2516/62548919.jpg


I'm hopeless to solve this problem
you can give me a hint before solving the problem!
Thanks in advance
 
Last edited by a moderator:
Physics news on Phys.org
  • #2
You might try rewriting this as
[tex]\lim_{n \to \infty}\frac{(A + (1/n))^4 - A^4}{1/n}[/tex]

In this form, the expression has the indeterminate form [0/0], so you can use L'Hopital's Rule on it.
 
  • #3
still can't solve it ...we can factorize the numerator but still makin no sense...Can u make it simpler?
 
Last edited:
  • #4
Did you try L'Hopital's rule?

Can you post your work?
 
  • #5
Do you know how to use L'Hopital's Rule?

A slightly different approach is this, with h = 1/n
[tex]\lim_{h \to 0^+}\frac{(A + h)^4 - A^4}{h}[/tex]
 
  • #6
No...I don't know anything about this rule we don't study it at school and they can't give us a problem on a rule which we haven't studied yet :(
 
  • #7
Well, if you use Mark44's substitution you won't need to use L'Hopital's rule
 
  • #8
You need to show us what work you have done on the problem, Misr, even if it's just thoughts about it. It is unacceptable to just post a question and say "I can't do it".

And a reminder for homework helpers: our goal is to help posters do a problem, not to give them answers. The OP has gotten plenty of advice, and his own idea that he didn't post the work for sounds like a very workable approach too. If he doesn't start showing that he's done anything with any of that, then it is inappropriate to give further "help".
 
  • #9
You need to show us what work you have done on the problem, Misr, even if it's just thoughts about it. It is unacceptable to just post a question and say "I can't do it".
[/quoye]
Yep, I totally agree and I DO respect this ...but my work is very random and terrible and it has nothin to do with the right answer...I tried your creative ways before..so I agree with that ...it gives excellent results
hope you can understand this
Thanks very much
 
  • #10
Have you tried expanding:
[tex]
(A+n^{-1})^{4}=A^{4}+4\frac{A^{3}}{n}+6\frac{A^{2}}{n^{2}}+4\frac{A}{n^{3}}+\frac{1}{n^4}
[/tex]
I think that this will solve your problem.
 

FAQ: Solving a Problem I'm Hopeless With: A Hint Needed!

How do I know if I am truly hopeless with a problem?

It is important to remember that no one is truly hopeless with a problem. It may just take more time, effort, and resources to find a solution. Consider seeking help from others or trying different approaches.

What should I do if I can't find a solution on my own?

Don't be afraid to ask for help from others, whether it's a friend, colleague, or expert in the field. Sometimes getting a fresh perspective can help you see the problem in a different light and lead to a solution.

How can I break down a complex problem into smaller, more manageable parts?

Start by identifying the main components of the problem and breaking them down into smaller, more specific tasks. Then prioritize these tasks and tackle them one at a time. This can help make the problem feel more manageable and less overwhelming.

How can I stay motivated when facing a difficult problem?

First, remind yourself that failure is a natural part of problem-solving and it's okay to make mistakes. Celebrate small victories and give yourself breaks when needed. It can also be helpful to break the problem into smaller tasks, as mentioned before, so you can see progress along the way.

Are there any strategies or techniques that can help me solve a problem I'm hopeless with?

Yes, there are various problem-solving techniques such as brainstorming, trial and error, and using visual aids. It may also be helpful to step away from the problem and come back to it with a fresh perspective. Don't be afraid to try different approaches and be open to feedback from others.

Similar threads

Back
Top