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

Luigi0210 Group Title

Integration:

  • 5 months ago
  • 5 months ago

  • This Question is Closed
  1. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    \[\LARGE \int_{-1}^{0}~\frac{e^{1/x}}{x^3}~dx\]

    • 5 months ago
  2. ganeshie8 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    sub u = 1/x

    • 5 months ago
  3. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    try letting u=1/x so x=1/u

    • 5 months ago
  4. dan815 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    then do parts

    • 5 months ago
  5. Joshyboi25tolyfe Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Guys guys... In the eyes of god, mathematics doesn't exist! Now, let's all hold hands and pray.

    • 5 months ago
  6. ganeshie8 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah u can't avoid parts i think

    • 5 months ago
  7. dan815 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    mathematics is a language and God gave us languages

    • 5 months ago
  8. dan815 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so shut your 3.14 hole

    • 5 months ago
  9. Joshyboi25tolyfe Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    LOLOL ^

    • 5 months ago
  10. dan815 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    :)

    • 5 months ago
  11. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    \[\LARGE \int_{-1}^{0}~\frac{e^{1/x}}{x^3}~dx\] \[\LARGE =\int_{-1}^{0}~\frac{1}{x}~e^{1/x}~\frac{1}{x^2}~dx\] \(\Large u=1/x\) and \(\Large du=-\frac{1}{x^2}dx\) \[\LARGE \int_{-1}^{0}~ue^udu\] And then use parts like dan said?

    • 5 months ago
  12. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    *\[\LARGE -\int_{-1}^{0}~ue^udu\]

    • 5 months ago
  13. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    you should have an improper integral

    • 5 months ago
  14. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    \[\LARGE \LARGE \lim_{t \rightarrow 0} \int_{-1}^{t}~ue^udu~\]?

    • 5 months ago
  15. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    of x is between -1 and 0 and u=1/x |dw:1402252341171:dw|

    • 5 months ago
  16. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    as we approach 0 from the left what is u getting approaching?

    • 5 months ago
  17. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1402252495152:dw|

    • 5 months ago
  18. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    we are looking to the left of 0 because our interval is -1 to 0 none of our values occur to the right of 0 so we won't bother to look there

    • 5 months ago
  19. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    i'm asking him to evaluate the following: \[\lim_{x \rightarrow 0^-}\frac{1}{x}\]

    • 5 months ago
  20. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    lugi0210 just read the graph above as our x values get near the 0 number (from the left) what do your u values (or if you want call them y values) do?

    • 5 months ago
  21. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    \(\Large -\infty\)?

    • 5 months ago
  22. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    right so i'm going to change one thing in your lim from earlier \[\LARGE \LARGE \lim_{t \rightarrow - \infty} \int\limits_{-1}^{t}~ue^udu~ \]

    • 5 months ago
  23. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    i think there should be a negative in front of that

    • 5 months ago
  24. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    \[- \LARGE \LARGE \lim_{t \rightarrow - \infty} \int\limits\limits_{-1}^{t}~ue^udu~\]

    • 5 months ago
  25. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    you know from the du=-1/x^2 dx thing

    • 5 months ago
  26. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    now use integration by parts then evaluate the limit

    • 5 months ago
  27. Luigi0210 Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    Alright, I see it now, it was the limits that was throwing me off >_< Thank you myininaya :)

    • 5 months ago
  28. ganeshie8 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    if u feel lazy about changing the bounds, you may try below : 1) Find the indefinite integral first 2) plugin the bounds

    • 5 months ago
  29. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    @Luigi0210 did you get it?

    • 5 months 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.