Problem 39 of 7
Write an explicit geometric sequence rule for the terms 2, -6, 18, -54.
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express nth term using first term and ratio.
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Terms must have a constant ratio and use first-term indexing.
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Solution
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1. Identify a_1 and common ratio r.
2. Use a_n = a_1*r^(n - 1).
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Exponent n when it causes the first term to be wrong.