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anonymous

  • one year ago

Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7, ...

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  1. anonymous
    • one year ago
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    @Nnesha Would it be an = 7 • (-1)n - 1?

  2. anonymous
    • one year ago
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    Or an = 7 • (-1)n

  3. xapproachesinfinity
    • one year ago
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    depends what you start with n=0 or n=1?

  4. anonymous
    • one year ago
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    How can I tell? @xapproachesinfinity

  5. xapproachesinfinity
    • one year ago
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    if you decided to start with n=1 as your first term then a_n= 7.(-1)^{n-1}

  6. welshfella
    • one year ago
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    your first one is correct 7 * (-1)^(n-1)

  7. anonymous
    • one year ago
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    Oh ok thanks so much! Could you help me with another one?

  8. xapproachesinfinity
    • one year ago
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    there is no consequence in choosing an=7(-1)^n as a correct answer as well

  9. xapproachesinfinity
    • one year ago
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    it really depends on what i said

  10. anonymous
    • one year ago
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    For Find the vertices and foci of the hyperbola with equation quantity x minus 5 squared divided by 144 minus the quantity of y minus 4 squared divided by 81 = 1. Would the answer be -5?

  11. welshfella
    • one year ago
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    this is a geometric series with common ratio = -1

  12. xapproachesinfinity
    • one year ago
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    both are good as i see it

  13. xapproachesinfinity
    • one year ago
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    just point that n>0 if you choose the first

  14. xapproachesinfinity
    • one year ago
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    otherwise choose the second

  15. anonymous
    • one year ago
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    Ok thanks For Find the vertices and foci of the hyperbola with equation quantity x minus 5 squared divided by 144 minus the quantity of y minus 4 squared divided by 81 = 1. Would the answer be -5?

  16. xapproachesinfinity
    • one year ago
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    post that on different post

  17. anonymous
    • one year ago
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    Ok

  18. welshfella
    • one year ago
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    I see your point "xapproachesinfinity but in the case of a geometric series it always seems to start with n = 1.

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