How do you find the 10th term in the geometric sequence -2,6,-18,...? Precalculus Sequences Geometric Sequences 1 Answer Typo Jun 24, 2018 39366 Explanation: Formula for a_nth term geometric series: ar^(n-1), where a is the first term and r 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 Answer link Related questions What is meant by a geometric sequence? What are common mistakes students make with geometric sequences? How do I find the equation of a geometric sequence? How do I find the first term of a geometric sequence? How do I find the common ratio of a geometric sequence? How can I recognize a geometric sequence? How do I use a geometric series to prove that 0.999...=1? What is the common ratio of the geometric sequence 7, 28, 112,...? What is the common ratio of the geometric sequence 1, 4, 16, 64,...? What is the common ratio of the geometric sequence 2, 6, 18, 54,...? See all questions in Geometric Sequences Impact of this question 16956 views around the world You can reuse this answer Creative Commons License