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anonymous

  • 5 years ago

What is the sum of the geometric sequence 8, –16, 32 … if there are 15 terms?

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  1. anonymous
    • 5 years ago
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    \[a\frac{(1-r^{n+1})}{(1-r)}\]

  2. anonymous
    • 5 years ago
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    so would it be 87384?

  3. anonymous
    • 5 years ago
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    \[\sum _{n=0}^{15} (8)(-2)^n\] \[8\sum _{n=0}^{14} (-2)^n\] 8((1-(-2)^15))/(1+2) http://www.wolframalpha.com/input/?i=8%28%281-%28-2%29%5E15%29%29%2F%281%2B2%29 yes

  4. anonymous
    • 5 years ago
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    wanna do some more for me? :)

  5. anonymous
    • 5 years ago
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    no, I think you can handle it

  6. anonymous
    • 5 years ago
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    I don't think so

  7. anonymous
    • 5 years ago
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    yes, you got the right answer

  8. anonymous
    • 5 years ago
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    i googled it... i wanted to see if it was correct

  9. anonymous
    • 5 years ago
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    do some more , you will get the hang of it

  10. anonymous
    • 5 years ago
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    Thanks.

  11. anonymous
    • 5 years ago
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    and if you get stuck , post it ; you will be helped

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spraguer (Moderator)
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