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



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

Tinascott
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yes

Tinascott
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can you help me?

BangkokGarrett
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I have an answer, but I'm \not sure how \to explain how I got it.LOL

BangkokGarrett
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\[a _{n}=5\times(4)^{(n1)}\]

BangkokGarrett
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Plug in n=1 and you get 5, plug in n=2 and you get 20, plug in ....etc

Tinascott
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i understand now how to do it now thanks