Identify the 12th term of a geometric sequence where a1 = 8 and a6 = -8,192.
Solution:
The nth term of a geometric sequence is given by
an = a1 × rn - 1 ---------> (1)
Given, a1 = 8, a6 = -8192, n = 12
To find r put the value of a1 and a6 in (1)
-8192 = 8 × r(6 - 1)
r5 = -8192/8
r5 = 1024
r = \(\sqrt[5]{1024}\)
r = -4
Now, find a12
a12 = a1 × r11
a12 = 8 × (-4)7
= 8 × (-16,384)
a12 = -131072
Therefore, the 12th term of the series is -131072.
Identify the 12th term of a geometric sequence where a1 = 8 and a6 = -8,192.
Summary:
The12th term of the geometric sequence where a1 = 8 and a6 = -8192 is -131072.
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