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3 years ago

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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