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

saifoo.khan

Logarithms

  • one year ago
  • one year ago

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

    I thought you were soo smart, that you would know them by now. LOL jk jk.

    • one year ago
  2. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Lol. I'm not a calculator. I can get stuck too! :P @OpenstudyUser

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

    Try distributing.

    • one year ago
  4. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    \[ \Large 9^{2x} + 2(9^{x+1}) = 40 \] Correction^

    • one year ago
  5. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Just tell me the next and step after that please.

    • one year ago
  6. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    write 9^(x+1) as 9^x.9 then put y=9^x. solve the quadratic

    • one year ago
  7. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    DANG!!! KILL ME!!!! My teacher told me that. -_- Thanks for recalling @hartnn

    • one year ago
  8. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Just guessing, can't we do it like this? \[9^{2x} + 2(9^x \times 9) = 40\] Ans so on?

    • one year ago
  9. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Next? @micahwood50

    • one year ago
  10. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    didn't i tell u to do just that?

    • one year ago
  11. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes, but you said me to write 9^x = y Got that. But can't we solve it by another way? Something like: \[9^{2x} + 2(9^x)\times 18=40\]

    • one year ago
  12. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    nopes, i don't think so....no formula for log(a+b) or log (a-b)

    • one year ago
  13. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    I see. THanks man.

    • one year ago
  14. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Did you missed a +sign in your first step? @micahwood50

    • one year ago
  15. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    @OpenstudyUser kept on distributing. :D

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

    I atleast tried -_-

    • one year ago
  17. micahwood50
    Best Response
    You've already chosen the best response.
    Medals 0

    Just do what hartnn told you to do.

    • one year ago
  18. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    I want to learn your method too! @micahwood50

    • one year ago
  19. micahwood50
    Best Response
    You've already chosen the best response.
    Medals 0

    My "method" is incorrect. I just though lnab = ln (a + b), but it's actually lna + lnb so forgot it.

    • one year ago
  20. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh. No problem. Thanks for trying though. :)

    • one year ago
  21. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    I solved it @hartnn . got: x = 0.315

    • one year ago
  22. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    what roots of quadratic did u get?

    • one year ago
  23. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    2, -20

    • one year ago
  24. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    yup. can't be -20 so 9^x=2 x=0.315 u are correct!

    • one year ago
  25. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 1

    Yep. Thanks.

    • 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.