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 * Aim: How do we determine the first n terms of a geometric series?** //(This formula is listed on the Regents Reference Sheet as **Sum of a Geometric Series**)//

At the end of the lesson, you will be able to...
 * 1) define geometric series
 * 2) compare and contrast a geometric sequence with a geometric series
 * 3) explore and discover the formula for finding the sum of n terms of a geometric series
 * 4) apply the formula to problems when given as a sum or described verbally

As you watch the videos, answer the following questions... 1. What is a geometric series? 2. How does a geometric series differ from a geometric sequence? 3. Write the formula in your notebook.


 * Notice** how in the videos, the instructors write the information they need to know on the side to organize themselves before they begin the work

[|Video 1]

This next video shows you two problems. You may ignore the second problem as we have not learned that yet.

[|Video 2]


 * Homework:** Work on problems 3-13 odd, 23, 25, 27

[|Geo_Series.JPG]


 * Answers:**

[|A-Geo_Series.JPG]


 * Journal entry:** Describe a real-world situation that involves finding the sum of a geometric series. Indicate what the common ratio is in your description.