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Ambition

  • 2 years ago

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -2 and 16, respectively.

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  1. zzr0ck3r
    • 2 years ago
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    err 1-2+4-8+16 so (-1)^n*2^n

  2. zzr0ck3r
    • 2 years ago
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    or (-2)^n ...

  3. Ambition
    • 2 years ago
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    @zzr0ck3r these are my possible answers: (a) an = 1 • (-2)n - 1 (b) an = 1 • 2n (c) an = 1 • (-2)n + 1 (d) an = 1 • 2n - 1

  4. Ambition
    • 2 years ago
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    @zzr0ck3r??

  5. zzr0ck3r
    • 2 years ago
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    do you consider n to be natural?

  6. Ambition
    • 2 years ago
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    yes

  7. Ambition
    • 2 years ago
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    n = the term

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