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# 8.6 notes - a special formula for geometric sequences...

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Section 8.6 Geometric Sequences

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Objectives To form geometric sequences To use formulas when describing geometric sequences
Find the next two terms in the sequence 3, 6, 12, 24, … This is a geometric sequence: Common ratio:

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Find the common ratio for each sequence: 1) 5, 10, 20, 40, 80, … 2) 3, 9, 27, 81, … 3) 180, 60, 20, … Now find the next 3 terms in the examples above.
Just like with arithmetic sequences, we have

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Unformatted text preview: a special formula for geometric sequences: Let’s go back and find the 10th term of our previous example 3) 180, 60, 20, … 1 ) (-⋅ = n r a n A Find the common ratio and the 1st, 7th and 18th term of each sequence 1) 2) 3) 1 3 4 ) (-⋅ = n n A 1 5 2 ) (-⋅-= n n A 1 2 1 180 ) (- ⋅ = n n A Homework page 427 2, 5, 11, 14, 20, 23, 25, 31, 36, 37, 42, 44...
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8.6 notes - a special formula for geometric sequences...

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