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How do I write an explicit formula for this sequence? 2, 6, 18, 54, 162, ... I already know the common difference is x3.

How do I write an explicit formula for this sequence? 2, 6, 18, 54, 162, ... I already know the common difference is x3.
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2 votes
How do I write an explicit formula for this sequence? 2, 6, 18, 54, 162, ... I already know the common difference is x3.

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User Cripto
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7.3k points

1 Answer

4 votes
If the common difference is 3 all you need to do is:
an=a1 - d(n-1)
2 - 3d + 3
Explicit rule = -3n + 5
answered
User Gene Karasev
by
6.8k points
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