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anonymous

  • one year ago

Will medal and fan What is the sum of the geometric sequence -4, 24, -144 . . . if there are 6 terms? -159,963 26,660 26,661 159,963

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  1. anonymous
    • one year ago
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    do 144 times neg 6 and that times neg 6 and that again times neg 6 to get all 6 terms

  2. anonymous
    • one year ago
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    then add them

  3. anonymous
    • one year ago
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    I did and the answer I got isn't the same as the options

  4. xapproachesinfinity
    • one year ago
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    you mean the sum of geometric series not sequence?

  5. anonymous
    • one year ago
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    No it says sequence

  6. xapproachesinfinity
    • one year ago
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    first you need to find all the 6 terms then sum up

  7. xapproachesinfinity
    • one year ago
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    you have three terms so you are missing three more to make 6 terms

  8. xapproachesinfinity
    • one year ago
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    what is the fourth term?

  9. anonymous
    • one year ago
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    864, -5184, 31104 thee are the next three terms. At least that's what I got. If I add them up I don't get one of the answers they provide

  10. xapproachesinfinity
    • one year ago
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    hmm really then you must of made a mistake

  11. xapproachesinfinity
    • one year ago
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    how did you get the fourth term for example

  12. anonymous
    • one year ago
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    \[-144 \times -6 = 864\]

  13. xapproachesinfinity
    • one year ago
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    yes!

  14. xapproachesinfinity
    • one year ago
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    you should get the right answer i don't where you missed

  15. xapproachesinfinity
    • one year ago
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    let's try doing the fomula \[S_n=\frac{a(1-r^n)}{(1-r)}\]

  16. xapproachesinfinity
    • one year ago
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    a=first term n=6 r=-6

  17. xapproachesinfinity
    • one year ago
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    @Tarynrachelle where you going?

  18. anonymous
    • one year ago
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    I'm still here I'm doing the problem

  19. xapproachesinfinity
    • one year ago
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    well low and behold i get one of the answer choices

  20. xapproachesinfinity
    • one year ago
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    you should get the right answer once you do the calculations

  21. anonymous
    • one year ago
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    The third answer?

  22. xapproachesinfinity
    • one year ago
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    and actually i get the correct answer even the method i told you in the start without formula. all of them should work since the formula came from it to begin with

  23. xapproachesinfinity
    • one year ago
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    no

  24. anonymous
    • one year ago
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    Idk what I'm doing wrong then.

  25. xapproachesinfinity
    • one year ago
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    well to me they all give the same answer, something must be wrong in yur work

  26. xapproachesinfinity
    • one year ago
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    anyway you got the formula, you got the other way just see where you had missed things

  27. xapproachesinfinity
    • one year ago
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    did you do it yet?

  28. xapproachesinfinity
    • one year ago
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    use the formula

  29. anonymous
    • one year ago
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    Okay well this is what I plug into the formula\[S _{n}=\frac{ 4(1-(-6)^{6}) }{ (1-(-6)) }\] am I wrong?

  30. xapproachesinfinity
    • one year ago
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    yeah

  31. anonymous
    • one year ago
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    That's supposed to be a -4

  32. xapproachesinfinity
    • one year ago
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    yes -4 not 4 just about to say that

  33. anonymous
    • one year ago
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    Is it still wrong even with the -4? Or is it correct with the -4?

  34. xapproachesinfinity
    • one year ago
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    it is correct with -4

  35. anonymous
    • one year ago
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    Okay. Hold on I think I see where I messed up

  36. anonymous
    • one year ago
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    Nope still not getting one of the answer choices..

  37. anonymous
    • one year ago
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    I plug it into my calculator and get 186614. That's the same answer I get when I add them all up

  38. anonymous
    • one year ago
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    Could you explain the steps for me so I know what I'm doing wrong?

  39. xapproachesinfinity
    • one year ago
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    hold a sec

  40. xapproachesinfinity
    • one year ago
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    ok back

  41. xapproachesinfinity
    • one year ago
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    how did you put it in your calc?

  42. anonymous
    • one year ago
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    \[-4(1-(6)^6)\div(1-(6))\]

  43. xapproachesinfinity
    • one year ago
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    no bottom is (1-(-6))=1+6

  44. xapproachesinfinity
    • one year ago
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    where are the negatives of 6?

  45. anonymous
    • one year ago
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    My calculator wasn't getting the right answer but this is it http://www.wolframalpha.com/input/?i=-4%281-%28-6%29%5E6%29%2F%281-%28-6%29%29

  46. xapproachesinfinity
    • one year ago
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    well for the top you didn;t have to worry a lot of that negative since you have an even power but bottom no

  47. anonymous
    • one year ago
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    It's the second choice

  48. xapproachesinfinity
    • one year ago
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    yes!

  49. xapproachesinfinity
    • one year ago
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    i think you put the wrong format into your calc

  50. anonymous
    • one year ago
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    Probably. But thank you

  51. xapproachesinfinity
    • one year ago
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    No problem

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