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Tinascott

  • 2 years ago

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

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

  2. Tinascott
    • 2 years ago
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    yes

  3. Tinascott
    • 2 years ago
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    can you help me?

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

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

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

  7. Tinascott
    • 2 years ago
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    i understand now how to do it now thanks

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