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

nickersia Group Title

Question in comments, can someone help? :)

  • 2 years ago
  • 2 years ago

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

    \[4*\log_{x}2=\log_{2}x+3 \] (4*logx 2 = log2 x + 3)

    • 2 years ago
  2. estebananaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what is your question, exactly?

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

    Find x ? :D

    • 2 years ago
  4. estebananaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i think you can start by putting logx 2=log2 2/ log2 x

    • 2 years ago
  5. nickersia Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    The hint we get is change the base... There's formula \[\log_{a} b=\frac{ \log_{c}b }{ \log_{c}a }\] But I tried, I can't solve it

    • 2 years ago
  6. estebananaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you got then 4log2 2=(log2 x)*(log2 x + 3) and finally: (log2 x)^2+3log2 x + 4log2 2=0 now i think you can substitute log2 x by u, solve the quadratic equation and then once you have the values of u, compute the values for x: log2 x=u -----> x=2^u

    • 2 years ago
  7. estebananaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i didn't get the answer, but i think the procedure is correct

    • 2 years ago
  8. nickersia Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh, I think I get the idea, I'll try to solve it now, thank you! That was exactly what I was doing but I didn't saw that I can change log2 x with u and get quadratic

    • 2 years ago
  9. shining Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    first write log 2 x into 1/(logx 2) then t=logx 2 solve it!

    • 2 years ago
  10. shining Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hint:you will get two values that just one of them is acceptable

    • 2 years ago
  11. nickersia Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I got for x 2 and 1/16, why is only one acceptable?

    • 2 years ago
  12. estebananaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i think both are acceptable

    • 2 years ago
  13. nickersia Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    So and I, thanks guys, you helped me a lot :) It was important to me to get the idea how to do it, cause exam is tomorrow, and that was the only one I was struggling :) Thank you, all the best!

    • 2 years 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.