Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ranyai12

Can Someone Please Help! (problem is attached)

  • one year ago
  • one year ago

  • This Question is Closed
  1. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    • one year ago
    1 Attachment
  2. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    @Spacelimbus Please help! I know I asked you before but good news is I figured the other one out! so, if you can please help!

    • one year ago
  3. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm I don't have much practice with these, but if I am not completely mistaken then you have to find a general solution first and then a special solution?

    • one year ago
  4. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    General solution means, solving the homogenous differential equation, setting \(g(x)=0 \)

    • one year ago
  5. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    To find \(g(x)\) you can just take the inverse of the right hand side.

    • one year ago
  6. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    Can you check one answer? \[\Large e^{-3t}+xe^{-3t}+e^{-t}-e^{-6t}+C \] C not yet calculated.

    • one year ago
  7. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    if none of that is correct, then I wouldn't know how to get this problem right, because of the delta function.

    • one year ago
  8. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    my guess is that only the first two are right, given by the homogenous system.

    • one year ago
  9. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    A few adds here for the right hand side \[\Large \mathcal{L}_t \lbrace \delta(t-1) \rbrace(s)=e^{-s} \]

    • one year ago
  10. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    whats C?

    • one year ago
  11. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    a constant, haven't solved, but I am at doubt that the solution is correct for the third and the fourth term in general.

    • one year ago
  12. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    you cant get partial credit so I can only check it at the end

    • one year ago
  13. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    hehe I actually get C=0 for the one above, so something looks dodgy

    • one year ago
  14. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    no wait, C=1

    • one year ago
  15. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    ok let me check

    • one year ago
  16. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    If that doesn't work, I believe we have to do it step by step and can't separate it, which will be more work but should work.

    • one year ago
  17. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    since we have initial conditions.

    • one year ago
  18. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    it's wrong:(

    • one year ago
  19. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    did you correct the x? Of course it should be there (-:

    • one year ago
  20. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    the other solution I got was this one \[\Large 16te^{-3t}+e^{-t}-e^{-6t} \]

    • one year ago
  21. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    ok let me check

    • one year ago
  22. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    it's wrong :(

    • one year ago
  23. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    Did you come to this point @ranyai12 ? \[\Large Y=\frac{e^{-t}-e^{-6t}+16}{(s+3)^2} \]

    • one year ago
  24. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    yea but dont we stop there

    • one year ago
  25. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\Large Y= \frac{e^{-s}}{(s+3)^2}- \frac{e^{-6s}}{(s+3)^2}+ \frac{16}{(s+3)^2} \]

    • one year ago
  26. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    yea thats what I got earlier and it was wrong

    • one year ago
  27. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    That's not the solution we've got to inverse it.

    • one year ago
  28. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    oh

    • one year ago
  29. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    So inverse that and you should get the solution

    • one year ago
  30. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    It's a step side function, from what I think, which would make sense too, I made a mistake earlier by keeping the time domain.

    • one year ago
  31. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok

    • one year ago
  32. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    try that and then please tell me if it's correct.

    • one year ago
  33. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    I did the step and it ended up being wrong

    • one year ago
  34. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    i ended up getting (e^(-3t))(-e^(18)(t-6)step(t-6)+e^(3)(t-1)step(t-1)+16t)

    • one year ago
  35. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    yea that doesnt work

    • one year ago
  36. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    I was checking on a similar problem and they attempt the problem the exact same way as we do.

    • one year ago
  37. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    i know thats what confused me! I did it twice and got the same asnwer

    • one year ago
  38. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    can your program read it? Or do you need to substitute something for the stepside function ??

    • one year ago
  39. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    i only have to substitute the theta to the wrod stepwhich i did and it was still wrong

    • one year ago
  40. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    somewhere in my notes I have an error.

    • one year ago
  41. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    got that @ranyai12 ?

    • one year ago
  42. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    yea

    • one year ago
  43. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    We are only two constants off but I can't see where I have made the algebraic error yet.

    • one year ago
  44. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    I ran out of tries anyway but thanks though and if you figure it out please let me knoe because it's killing me!

    • one year ago
  45. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    yeh I will.

    • one year ago
  46. ranyai12
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you!

    • one year ago
  47. Spacelimbus
    Best Response
    You've already chosen the best response.
    Medals 0

    no problem

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.