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

steel11

differentiate ln(7e^-x+xe^-x)

  • one year ago
  • one year ago

  • This Question is Closed
  1. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer was 1/f(x) * f'(x). but it keeps saying wrong

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

    first take e^(-x) common from (7e^-x+xe^-x) then use the property of log. log ab=log a + log b

    • one year ago
  3. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    so, ln e^-x(7+x)?

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

    answer=(-7e^-x+e^-x-xe^-x)/(7e^-x+xe^-x)

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

    ln [e^-x(7+x)] now use log ab = log a +log b

    • one year ago
  6. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    so, lne^-x+ln(7+x), and go from there?

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

    u can simplify ln(e^(-x)) do u know how ?

    • one year ago
  8. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    no, im afraid not goku. :l

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

    \(\huge ln e^{(a)}=aln e=a\) now ?

    • one year ago
  10. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ye, makes sense.

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

    so lne^-x+ln(7+x) = ?

    • one year ago
  12. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    so, -x+ln(7+x)? is that right so far?

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

    yes, that is correct :) now its differentiation is simple....

    • one year ago
  14. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    -1+...ermm 1/(7+x)*1?

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

    that is absolutely correct (except for ...ermm part) simplify it further

    • one year ago
  16. steel11
    Best Response
    You've already chosen the best response.
    Medals 0

    lol, wow. thank you goku san.

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

    welcome ^_^

    • 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.