What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of -8?
O an = 4(-2)" - 1; all integers where n 20
O a = 4(-2)" - 1; all integers where n 2 1
O an = 4(-12)" - 1; all integers where n 2 1
O a = 4(-12)" - 1; all integers where n 20

The explicit equation for the given geometric sequence is an = 4(−2)n − 1; all integers where n ≥ 20. The domain for the geometric sequence is all positive integers except 0.

Step-by-step explanation:

It is given that the first term of the geometric sequence is 4 and the second term is -8.

The common ratio for the sequence is

The explicit equation for a given geometric sequence is

where, a is first term, n is number of term and r is common ratio.

The explicit equation for the given geometric sequence is

Here n is the number of term. So, the value of n is must be a positive integer except 0.

Therefore the domain for the geometric sequence is all positive integers except 0.

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i think the third one

Step-by-step explanation: