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nika2105 [10]
3 years ago
5

Determine the explicit formula of the following sequence -3,-18,-108...

Mathematics
1 answer:
kvv77 [185]3 years ago
3 0

Answer:

a_{n} = - 3(6)^{n-1}

Step-by-step explanation:

Note the common ratio r between consecutive terms, that is

r = - 18 ÷ - 3 = - 108 ÷ - 18 = 6

This indicates the sequence is geometric with n th term ( explicit formula )

a_{n} = a(r)^{n-1}

where a is the first term and r the common ratio

Here a = - 3 and r = 6, thus

a_{n} = - 3(6)^{n-1}

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Let's go:


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I hope I helped you.


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