1. Homework Questions

2. Geometric Sequences
Mrs. Ramsey

3. Geometric Sequences
In a geometric sequence, the ratio between consecutive terms is constant.
This ratio is called the common ratio.
To find r:

4. Geometric, Arithmetic, Neither? (find the next 2 terms if so)
5, 15, 45, 135…
15, 30, 45, 60…
6, -24, 96, -384…
8, 20, 32, 44…

5. Geometric Sequences Formulas
Recursive Formula
an = an-1 r
Explicit Formula
an = a1 rn-1

6. Find the 19th term…
11, 33, 99, 297…
20, 17, 14, 11, 8…

7. FYI - Graphs Arithmetic Graphs are linear
Geometric Graphs are exponential

8. Geometric Mean Geometric Mean = 20, _____, 80 3, ____, 18, 75
28, ____, 5103

9. Homework
Worksheet!
Sticker sheet online – only do evens