A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Find the specified nth term in the expansion of the binomial. (Write the expansion in descending powers of x.) (x + 5y)^10, n = 4 A. 210x^6y^4 B. 15,000x^7y^3 C. 210x^6y^4 D. 9,765,625y^10 E. 5040x^6y^4

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    n=10? I believe??? \

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

    nevermind... term in the expansion

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

    which is a different variable rth term of expansion

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I guess I understand how to write it all out just not how to simplify it correctly to get a condensed answer like the ones they provide

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut54_bi_theor.htm Look at example 8... if you have problems I'll do it out for you

  6. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    pascals triangle

  7. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ha ha I'm on that site right now trying to work it out lol Does it matter though if it's rth term or nth term?

  8. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    doesn't matter coz thats just a variable

  9. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1 1,1 1,2,1 1,3,3,1 1,4,6,4,1 1,5,10,10,5,1 1,6,15,20,15,6,1 1,7,21,35,35,21,7,1 1,8,28,56,70,56,28,8,1 1,9,36,84,126,126,84,36,9,1 1,10,45,120,210, ....

  10. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    well if you are following the site, the rth term is 4, the nth term is 10

  11. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    120 (x^7) (y^3)

  12. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    answer is b though

  13. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    120 (x^7) ((5y)^3)

  14. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    120.125 x^7 y^3 15000 x^7 y^3

  15. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    BBBBBBBBBB

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

    \[{10 \choose 4 }=210\] 4th term is \[210 x^6 (5y)^4\]

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

    of course i could be wrong. the 'n=4' is not clear.

  18. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    lol..... im prolly wrong :)

  19. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    wow ok the answer I got isn't even close to any of these.... I got 100800x^7125y^3....not quite sure what id id wrong

  20. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the 4th term is 120 x^7 y^3 as a standard... tehn you have to account for the coeefs in the original problem....namely the +5 attached to the y

  21. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    120 x^7 (5y)^3

  22. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    120.125 x^7 y^3 15000 x^7 y^3 :)

  23. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok makes sense ok Can I try another one on my own and have you check it?

  24. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sure; but you can check it with pascals triangle; i posted that first to like half the 10th spot ;)

  25. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok :)

  26. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok the problem is: Find the specified nth term in the expansion of the binomial. (Write the expansion in descending powers of x.) (x - 2y)^12, n = 6 I got 760x^7y^5 which is definitly not one of my answer choices....

  27. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    at 6 eh 12 11 10 9 8 7 x^6 y^6 is gonne be the variable answers

  28. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you got any with ony an x^6 y^6 as an asnswer?

  29. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh it's cause I used the 12 instead of the six let me try it again....

  30. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ack..you were right with the x and y lol...i lost count :)

  31. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    x^7 y^5 is the 6th term

  32. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok so I was right now....idk how I got the 760.... cause that's nowhere close to their choices

  33. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    lol..... which choice has the right x and y parts?

  34. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    narrow it down if its multiple choice ;)

  35. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    - 25,344, but that just doesn't seem right to me oh well I guess

  36. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    well lets play detective shall we :) is the - part correct? -2^5 = a negative right? so i believe the negative is right... if its got the right x and y parts, then its a sure shot

  37. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok well thank you very much!

  38. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you know the binomial theorem?! It's quite easy to do it using this theorem.

  39. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    learning it I think i just have to keep practicing using cause I get numbers mixed up and stuff

  40. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I see.

  41. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ya it's weird I can find the x and y parts but the number before I somehow lkeep messing up

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.