How do you find the 10th term in the geometric sequence -2,6,-18,...?

1 Answer
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Jun 24, 2018

3936639366

Explanation:

Formula for a_nanth term geometric series: ar^(n-1)arn−1, where aa is the first term and rr is the common ratio.

In the sequence [-2, 6, -18, ...]
a = -2 and r = (a_2)/(a_1) = 6/(-2) = -3
therefore a_10 = ar^(10-1) = -2 * -3^9 = 39366

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