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Geometric sequence? math?
Identify the 12th term of a geometric sequence where a1 = 8 and a6 = -8,192.
A) 134,217,728
B) 33,554,432
C) -33,554,432
D) -134,217,728
1 Answer
Relevance
- ?Lv 79 years agoFavorite Answer
a(1) = 8
a(6) = -8192 = a(1) * r^5
r^5 = -1024, so r = -4 (looking at real solutions only)
a(12) = a(1) * r^11 = 8 * (-4)^11 = -(2^25) = -33554432, so the answer is (C)
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