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Tinascott

Write the explicit formula for the geometric sequence. -5, 20, 80

  • 8 months ago
  • 8 months ago

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  1. BangkokGarrett
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    Did you mean - 80? That's not a geometric sequence unless the 80 is negative.

    • 8 months ago
  2. Tinascott
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    yes

    • 8 months ago
  3. Tinascott
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    can you help me?

    • 8 months ago
  4. BangkokGarrett
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    I have an answer, but I'm \not sure how \to explain how I got it.LOL

    • 8 months ago
  5. BangkokGarrett
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    \[a _{n}=-5\times(-4)^{(n-1)}\]

    • 8 months ago
  6. BangkokGarrett
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    Plug in n=1 and you get -5, plug in n=2 and you get 20, plug in ....etc

    • 8 months ago
  7. Tinascott
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    i understand now how to do it now thanks

    • 8 months ago
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