What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of -8? (5 points)
an = 4(-2)n - 1; all integers where n ≥ 0
an = 4(-2)n - 1; all integers where n ≥ 1
an = 4(-12)n - 1; all integers where n ≥ 1
an = 4(-12)n - 1; all integers where n ≥ 0

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i know it's a or b but i don't know how to find the domain

what do you think the common ratio is...?
so
4 x r = -8
r = ?

i told you.. I know it's a or b i just don't know the domain

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