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anonymous

  • one year ago

Find an explicit rule for the nth term of a geometric sequence where the second and fifth terms are -36 and 2304, respectively.

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  1. anonymous
    • one year ago
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    do you have a general idea?

  2. anonymous
    • one year ago
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    i tried using this http://openstudy.com/study#/updates/513cdcd0e4b029b0182b5689 and i did -36 - ar 2304 = ar^4 2304 = ar * r^3 2304 = -36 * r^3 2304 = r^3????????

  3. anonymous
    • one year ago
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    with r being the common ratio but i didn't get an integer

  4. zepdrix
    • one year ago
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    your second to last step looks correct 2304 = -36 * r^3 what happened to the -36 in the next step? did you mean to divide the 2304 by that amount?

  5. anonymous
    • one year ago
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    r^3=2304/-36=?

  6. anonymous
    • one year ago
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    -64

  7. anonymous
    • one year ago
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    \[r^3=\left( ? \right)^3\] r=?

  8. anonymous
    • one year ago
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    cube root it = 4?

  9. anonymous
    • one year ago
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    no

  10. anonymous
    • one year ago
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    4^3=64

  11. anonymous
    • one year ago
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    \[r^3=-64=\left( -4 \right)^3,r=-4\]

  12. anonymous
    • one year ago
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    does that mean it would be an = 9 * (-4)^n - 1?

  13. anonymous
    • one year ago
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    correct.

  14. anonymous
    • one year ago
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    YAY thanks :)))

  15. anonymous
    • one year ago
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    yw

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