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Write an explicit formula for a^n , the nth term of the sequence 18,−6,2,

Write an explicit formula for a^n , the nth term of the sequence 18,−6,2,
asked 206k views
5 votes
Write an explicit formula for a^n , the nth term of the sequence 18,−6,2,

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User JP Maulion
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8.3k points

1 Answer

6 votes

Answer:

Explanation:


a_1=18\\\\a_2=-6=(18)/(-3) \\\\a_3=2=(-6)/(-3)=18*((1)/(-3) )^2\\\\a_4=18*((1)/(-3) )^3\\\\...\\a_n=18*((1)/(-3) )^(n-1)\\\\

The sequence is a GP with first term is 18 and ratio equal -1/3

answered
User Hannah
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8.5k points
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