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

Christos

Whats the integral of ln(x^2) ?

  • 10 months ago
  • 10 months ago

  • This Question is Closed
  1. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    ln(x^2) = 2ln(x)

    • 10 months ago
  2. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    what is the integral of ln(x)?

    • 10 months ago
  3. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    1/x ?

    • 10 months ago
  4. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    no that's the derivative

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

    wait

    • 10 months ago
  6. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    hint: let u = ln(x) and let dv = 1 dx

    • 10 months ago
  7. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    try not to just give answers? we can go to wolfram for that

    • 10 months ago
  8. primeralph
    Best Response
    You've already chosen the best response.
    Medals 0

    @zzr0ck3r still not the final answer; but I'll take it off

    • 10 months ago
  9. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    xln(x) ? I still refuse to go by the answer :D

    • 10 months ago
  10. primeralph
    Best Response
    You've already chosen the best response.
    Medals 0

    @Christos xlnx is not the answer. Use integration by parts

    • 10 months ago
  11. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    xln(x)-1

    • 10 months ago
  12. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    if you are just guessing you can go to wolframalpha and get the answer

    • 10 months ago
  13. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    I am not guessing I though x has a power of 1 so -1 at the end and outside of ln whatever is inside

    • 10 months ago
  14. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    I saw it somewhere long time ago but im not sure if its correct

    • 10 months ago
  15. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    u need to do integration by parts

    • 10 months ago
  16. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    is that what you are doing in class?

    • 10 months ago
  17. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    What is this, can you give me an example?

    • 10 months ago
  18. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    I am learning alone.

    • 10 months ago
  19. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    do you know what the product rule is with derivatives?

    • 10 months ago
  20. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    I do

    • 10 months ago
  21. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    it is like the inverse of that, it is how we undo that rule.

    • 10 months ago
  22. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    I would google it and read on it, it takes practice

    • 10 months ago
  23. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    the reverse?

    • 10 months ago
  24. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    sort of

    • 10 months ago
  25. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    do you know u substitution for integration?

    • 10 months ago
  26. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    yes

    • 10 months ago
  27. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    ok that "undoes" the chain rule, so now you need to learn by parts. there are both crucial to learning integration http://tutorial.math.lamar.edu/Classes/CalcII/IntegrationByParts.aspx

    • 10 months ago
  28. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    Look at this please: That's specifically what am trying to solve. http://screencast.com/t/0N48E4lhqM9

    • 10 months ago
  29. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    e^(2*lnx) = e^ln(x^2) = x^2 so you need the integral of x^2 not ln(x^2)

    • 10 months ago
  30. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    I solved it now :D I know how to find this thing very easy (x^3)/3 without any actual formula

    • 10 months ago
  31. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah:)

    • 10 months ago
  32. Christos
    Best Response
    You've already chosen the best response.
    Medals 1

    thanks

    • 10 months ago
  33. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 1

    np

    • 10 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.