Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

saifoo.khan

  • 2 years ago

Logarithms

  • This Question is Closed
  1. OpenstudyUser
    • 2 years ago
    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.

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

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

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

    Try distributing.

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

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

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

    Just tell me the next and step after that please.

  6. hartnn
    • 2 years ago
    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

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

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

  8. saifoo.khan
    • 2 years ago
    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?

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

    Next? @micahwood50

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

    didn't i tell u to do just that?

  11. saifoo.khan
    • 2 years ago
    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: \[9^{2x} + 2(9^x)\times 18=40\]

  12. hartnn
    • 2 years ago
    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)

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

    I see. THanks man.

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

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

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

    @OpenstudyUser kept on distributing. :D

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

    I atleast tried -_-

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

    Just do what hartnn told you to do.

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

    I want to learn your method too! @micahwood50

  19. micahwood50
    • 2 years ago
    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.

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

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

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

    I solved it @hartnn . got: x = 0.315

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

    what roots of quadratic did u get?

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

    2, -20

  24. hartnn
    • 2 years ago
    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!

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

    Yep. Thanks.

  26. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.