Find each sum:. 4, 12, 36, 108,... A sequence is geometric if each term is obtained by multiplying the previous term by the same number called the common.

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Essential Question: What is a sequence and how do I find its terms and sums? How do I find the sum & terms of geometric sequences and series?

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Presentation transcript:

Find each sum:

4, 12, 36, 108,... A sequence is geometric if each term is obtained by multiplying the previous term by the same number called the common ratio, r. The above sequence can be written as: Any term in a geometric sequence can be found using: Practice #6: p odds

Ex. Find the common ratio, the fifth term, and the nth term formula for the following geometric sequence:

Partial Sum of a Geometric Sequence

4, -12, 36, -108,... Practice #6: p odds This is the second part of #6

Arithmetic, Geometric or Neither

Bouncing Ball