Last Time Arithmetic SequenceArithmetic Series List of numbers with a common difference between consecutive terms Ex. 1, 3, 5, 7, 9 Sum of an arithmetic sequence Ex To find the nth term in an arithmetic sequence we use To find the sum of a finite arithmetic series we use

Sequence Vs. Series Is it an arithmetic sequence or an arithmetic series? What is the common difference (d)? , 12, 16, 20, … …

Section 11.3 Geometric Sequences and Series

Learning goals ●Geometric Sequence ●Find the nth Term ●Geometric Series ●Find the Sum

Ex. 2, 4, 8, 16, … r = r = Geometric Sequence Geometric Sequence has a constant (r) that when you multiply a term by r you get the next term in the sequence. We call r the common ratio

Write out the next 3 terms in the geometric sequence Write the first 3 terms out a 1 is our first term

Are the following sequences geometric or arithmetic or neither? 1, 2, 4, -8, … 1, 7, 13, 19, 25, … 81, 27, 9, 3, 1, …

81, 27, 9, 3, 1, … r = to find a 6, a 12, a n we can use the equation

Find a n of

Geometric Series Add the terms of a geometric sequence to get a geometric series To find the sum of the first n terms we use:

Find the S 6 of …

Find.

Find n such that S n = 341 of the geometric series …

Summary Geometric SequenceGeometric Series Sequence where you multiply a term by r to get the next term Ex. 1, 3, 9, 27, 81 Sum of a geometric sequence Ex To find the nth term in a geometric sequence we use To find the sum of a finite geometric series we use