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irvine

  • 3 years ago

What is the solution of log 2x – 3^125 = 3 ? Please help im taking a test right now

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  1. Hero
    • 3 years ago
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    Hi

  2. irvine
    • 3 years ago
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    hi

  3. jimmyrep
    • 3 years ago
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    is LHS = log of (2x - 3^125) or just log of 2x?

  4. irvine
    • 3 years ago
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    hmm. i have no clue the question is exactly the way i posted it that's what confused me

  5. Hero
    • 3 years ago
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    I was just about to ask that

  6. irvine
    • 3 years ago
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    That is basically why i dont understand it

  7. gabrielbean
    • 3 years ago
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    iw ould say move the log2x to one side on its own then re-arrange to remove the log then solve for x log2x=3+3^125 (assuming log is to base ten) 10^(3+3^125)=2x x=(10^(3+3^125))/2 i think...

  8. jimmyrep
    • 3 years ago
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    yes - thats right

  9. irvine
    • 3 years ago
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    thank you so much! :)

  10. Hero
    • 3 years ago
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    For some reason, I keep getting false for the answer

  11. gabrielbean
    • 3 years ago
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    so do i but that may be to do with the calculators memory

  12. irvine
    • 3 years ago
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    maybe

  13. Hero
    • 3 years ago
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    wolfram alpha's solution: http://www.wolframalpha.com/input/?i=log%282x%29%3D3%2B3^125%2C+x&a=*FunClash.log-_*Log10.Log-

  14. irvine
    • 3 years ago
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    i went to this website too and i got a completely different answer i guess it might be the way i typed the equation in

  15. Hero
    • 3 years ago
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    How did you type it in, and what website was that?

  16. Hero
    • 3 years ago
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    Ah, I think it's log base 2 of x

  17. irvine
    • 3 years ago
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    log 2x – 3^125 = 3 and the website was wolframalpha too

  18. irvine
    • 3 years ago
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    but the choices in the test are way different though

  19. Hero
    • 3 years ago
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    Hold on a sec

  20. Hero
    • 3 years ago
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    What are the answer choices?

  21. irvine
    • 3 years ago
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    x = 1 x = 4 x = 7/3 x = 1/3

  22. Hero
    • 3 years ago
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    That's bizarre. I've tried every possible way. It all comes out to the same answer

  23. irvine
    • 3 years ago
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    what answer did you get?

  24. Hero
    • 3 years ago
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    http://www.wolframalpha.com/input/?i=log2x-3^125%3D3

  25. Hero
    • 3 years ago
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    Exact result gives one form, alternate form gives false

  26. irvine
    • 3 years ago
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    hmmm.. this thing is so complicated :( i think im going to give up

  27. Hero
    • 3 years ago
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    Yeah, you should just guess

  28. Hero
    • 3 years ago
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    wait

  29. irvine
    • 3 years ago
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    that is what i am going to do

  30. Hero
    • 3 years ago
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    Very bizarre

  31. irvine
    • 3 years ago
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    I know I guessed 7/3 what do you think?

  32. Hero
    • 3 years ago
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    guess 1/3

  33. irvine
    • 3 years ago
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    okay that sounds better

  34. irvine
    • 3 years ago
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    Thanks for your help :)

  35. Hero
    • 3 years ago
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    What was the answer?

  36. irvine
    • 3 years ago
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    idk yet im on question 16 of the test and there is 4 more i will tell you once im done

  37. Hero
    • 3 years ago
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    Okay

  38. irvine
    • 3 years ago
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    they wont show me the correct answer but it was not 1/3

  39. Hero
    • 3 years ago
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    It wasn't any of them. It was a bogus question

  40. irvine
    • 3 years ago
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    I know but it doesnt really matter anymore since i still have a good grade in the class I just hope that i dont get anymore questions like this one

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