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anonymous

  • 5 years ago

Please help 1 - 1/4 + 1/16 – 1/64 + 1/256 – 1/1024 + 1/4096 Find the sum of the finite geometric series

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  1. anonymous
    • 5 years ago
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    so unnecessary to spam...

  2. anonymous
    • 5 years ago
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    sorry

  3. anonymous
    • 5 years ago
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    first define the geometric sequence.

  4. anonymous
    • 5 years ago
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    its the bottoms they all mutiply by themselves

  5. anonymous
    • 5 years ago
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    by x4

  6. anonymous
    • 5 years ago
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    not just 4, by negative 4 since it changes sign, correct?

  7. anonymous
    • 5 years ago
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    see thats where I get confused

  8. anonymous
    • 5 years ago
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    So you start with 1. You multiply by (-1/4) you get (-1/4)

  9. anonymous
    • 5 years ago
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    then you multiply again my -1/4

  10. anonymous
    • 5 years ago
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    so you get (1/16) since the negative multiplied by negative is a positive, correct?

  11. anonymous
    • 5 years ago
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    Yes

  12. anonymous
    • 5 years ago
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    So that, is what we call the "r" term in a geometric series (ie. the number we always multiply with)

  13. anonymous
    • 5 years ago
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    ok

  14. anonymous
    • 5 years ago
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    do you know the sum of a geometric sequence, the formula?

  15. anonymous
    • 5 years ago
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    so to find the sum? how do I use that with the figures

  16. anonymous
    • 5 years ago
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    No

  17. anonymous
    • 5 years ago
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    do u mean like s with the little n

  18. anonymous
    • 5 years ago
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    hmm... actually since your question is asking how to find the sum of the ***finite*** geometric series, you could probably add them all together

  19. anonymous
    • 5 years ago
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    so Id get 7/ over and bottom total added?

  20. anonymous
    • 5 years ago
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    Try again, in order to add fractions they need a common denominator...

  21. anonymous
    • 5 years ago
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    7/ 4096...OR DO YOU MEAN LIKE 28/4096

  22. anonymous
    • 5 years ago
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    ... it's actually 3277/4096

  23. anonymous
    • 5 years ago
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    oh...wow I like the page I will have to check that out.. thanks

  24. anonymous
    • 5 years ago
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    you could have also used the S n thing as well to figure it out. Probably easier.

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