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

marcybaby Group Title

Find the general term an for the geometric sequence a1=-3 and a2=6?

  • one year ago
  • one year ago

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

    \[a_{1}=-3 and a_{2}=6\]

    • one year ago
  2. RadEn Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    use the formula : an = a1 r^(n-1) with a1 is given -3 and to get the ratio(r), defined r = a2/a1 = 6/-3 = -2 therefore, an = a1 * r^(n-1) an = -3 * (-2)^(n-1) |dw:1367598379663:dw|

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

    so that's the answer? @RadEn I'm confused

    • one year ago
  4. nincompoop Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    it is not the answer, rather hint as how to solve the problem.

    • one year ago
  5. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ahhh!! i'm so lost and confused!! @nincompoop

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

    Can you find here the common ratio "r" ??

    • one year ago
  7. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    -2?

    • one year ago
  8. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yep..

    • one year ago
  9. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    So, general term can be found as: \[\large \color{green}{a_n = a \cdot r^{n-1}}\]

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

    a = -3 and r = -2.. Plug in and find..

    • one year ago
  11. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    6?

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

    How?

    • one year ago
  13. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Use that formula,

    • one year ago
  14. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    -3(-2)^n-1?

    • one year ago
  15. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yep, this is the general term you require...

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

    okay, but I am stuck here. I dont what is the next step

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

    i get 6^n-1?

    • one year ago
  18. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Hey, this is the required answer, you can't solve it further..

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

    so this cant get be simplified any more?

    • one year ago
  20. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    No..

    • one year ago
  21. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\large a_n = -3\cdot (-2)^{n-1}\]

    • one year ago
  22. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    okay... how come tho? 6^n-1 looks like an ideal answer to me.

    • one year ago
  23. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    You cannot multiply \(-3\) with \((-2)^{n-1}\)

    • one year ago
  24. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhhhhhhhhhh!!!!!!!!!! duh!! now i get it! my brain hurts been studing all week.

    • one year ago
  25. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    It is okay..

    • one year ago
  26. marcybaby Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you for your time and patience

    • one year ago
  27. waterineyes Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    You are welcome dear..

    • 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.