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hodyreva [135]
3 years ago
10

Write the explicit formula that represents the geometric sequence -2,8,-32,128.

Mathematics
1 answer:
Dmitriy789 [7]3 years ago
5 0

Answer:

a_{n} = - 2(-4)^{n-1}

Step-by-step explanation:

The n th term ( explicit formula ) for a geometric sequence is

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

where a is the first term and r the common ratio

Here a = - 2 and r = 8 ÷ - 2 = - 4, thus

a_{n} = - 2(-4)^{n-1}

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