Find the 9th term of the geometric sequence 9, -18, 36

asked Feb 17, 2021 121k views

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Find the 9th term of the geometric sequence
9, -18, 36

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Answer:

Explanation:

Geometric sequence: 9, -18 , 36 .....

common ratio = 2nd term / 1st term

= -18 /9 = -2

$a_(n)=ar^(n-1)\\\\a_(9)=9*(-2)^(8)\\\\=9*256\\\\= 2304$

Ambreen answered Feb 21, 2021

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