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umka2103 [35]
3 years ago
10

HELP

Mathematics
1 answer:
andrew11 [14]3 years ago
5 0

Answer:

aₙ = -2ⁿ⁻¹

Step-by-step explanation:

Your geometric series  is

-1,-2,-4, …

The first term (a₁) is -1, and each successive term is twice the one before it (the common ratio, r)

The formula for the nth term of a geometric series is

aₙ = a₁rⁿ⁻¹

The general formula for your series is then

aₙ = -2ⁿ⁻¹

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