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Contact [7]
3 years ago
8

What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of −8?

Mathematics
1 answer:
Olegator [25]3 years ago
3 0

Answer:

Option B is right

Step-by-step explanation:

Given:

There is a geometric sequence with first term =4

and second term =-8

We know that a geometric sequence is a sequence of numbers, in which each successive number is got by multiplying the previous number by a fixed value called common ratio.

First term is called a.

and common ratio is denoted by r.

The terms would be

a,ar,ar^{2} ,...

Here we have a=4 and ar =-8

So r =common ratio =-2

nth term we mean n can take values as 1,2.....

So general term

a_{n}=ar^{n-1}\\  =4(-2)^{n-1},n\geq1

is right answer

Hence option b.

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