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saifoo.khan

  • 3 years ago

Logarithms

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  1. OpenstudyUser
    • 3 years ago
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    I thought you were soo smart, that you would know them by now. LOL jk jk.

  2. saifoo.khan
    • 3 years ago
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    Lol. I'm not a calculator. I can get stuck too! :P @OpenstudyUser

  3. OpenstudyUser
    • 3 years ago
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    Try distributing.

  4. saifoo.khan
    • 3 years ago
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    \[ \Large 9^{2x} + 2(9^{x+1}) = 40 \] Correction^

  5. saifoo.khan
    • 3 years ago
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    Just tell me the next and step after that please.

  6. hartnn
    • 3 years ago
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    write 9^(x+1) as 9^x.9 then put y=9^x. solve the quadratic

  7. saifoo.khan
    • 3 years ago
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    DANG!!! KILL ME!!!! My teacher told me that. -_- Thanks for recalling @hartnn

  8. saifoo.khan
    • 3 years ago
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    Just guessing, can't we do it like this? \[9^{2x} + 2(9^x \times 9) = 40\] Ans so on?

  9. saifoo.khan
    • 3 years ago
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    Next? @micahwood50

  10. hartnn
    • 3 years ago
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    didn't i tell u to do just that?

  11. saifoo.khan
    • 3 years ago
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    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
    • 3 years ago
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    nopes, i don't think so....no formula for log(a+b) or log (a-b)

  13. saifoo.khan
    • 3 years ago
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    I see. THanks man.

  14. saifoo.khan
    • 3 years ago
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    Did you missed a +sign in your first step? @micahwood50

  15. saifoo.khan
    • 3 years ago
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    @OpenstudyUser kept on distributing. :D

  16. OpenstudyUser
    • 3 years ago
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    I atleast tried -_-

  17. micahwood50
    • 3 years ago
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    Just do what hartnn told you to do.

  18. saifoo.khan
    • 3 years ago
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    I want to learn your method too! @micahwood50

  19. micahwood50
    • 3 years ago
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    My "method" is incorrect. I just though lnab = ln (a + b), but it's actually lna + lnb so forgot it.

  20. saifoo.khan
    • 3 years ago
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    Oh. No problem. Thanks for trying though. :)

  21. saifoo.khan
    • 3 years ago
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    I solved it @hartnn . got: x = 0.315

  22. hartnn
    • 3 years ago
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    what roots of quadratic did u get?

  23. saifoo.khan
    • 3 years ago
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    2, -20

  24. hartnn
    • 3 years ago
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    yup. can't be -20 so 9^x=2 x=0.315 u are correct!

  25. saifoo.khan
    • 3 years ago
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    Yep. Thanks.

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