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Page 1: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Tuesday,  September 29, 2009

Goals: Recognize and evaluate logrithmic functions with base a.              Graph logrithmic functions with base a.              Recognize, evaluate and graph natural logrithmic functions.              Use logarithmic functions to model and solve real­life problems.Instructional DVD's: Logarithmic Functions and their Graphs. 34:47     DVD 2

Lesson 3.2Logarithmic Functions and Their Graphs

Title: Aug 19 ­ 9:03 PM (1 of 25)

Page 2: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Definition of Logarithmic Function

Title: Sep 26 ­ 8:57 AM (2 of 25)

Page 3: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 1 Evaluating Logarithms

Use the definition of logarithms to evaluate each logarithm at the indicatef value of x.

Title: Aug 24 ­ 5:28 PM (3 of 25)

Page 4: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 2Evaluating Common Logs on a Calculator

Title: Aug 24 ­ 5:33 PM (4 of 25)

Page 5: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Properties of Logarithms

Inverse Property

One­to­One Property

Title: Sep 26 ­ 8:58 AM (5 of 25)

Page 6: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 3Using Properties of Logarithms

Title: Aug 24 ­ 5:39 PM (6 of 25)

Page 7: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Graphs of Logarithmic Functions

Title: Aug 24 ­ 5:28 PM (7 of 25)

Page 8: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 4Graphs of Exponential and Logarithmic Functions

Title: Aug 24 ­ 5:45 PM (8 of 25)

Page 9: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 5

Sketching the Graph of Logarithmic Function 

Without calculator With calculator

1 2 3 4 5 6 7 8 9 10

1

­1

­2

2

3

Title: Aug 24 ­ 5:49 PM (9 of 25)

Page 10: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Library of Parent Functions: Logarithmic Function 

Title: Sep 29 ­ 4:57 AM (10 of 25)

Page 11: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 6Transformations of Graphs of Logarithmic Functions

Title: Aug 24 ­ 5:27 PM (11 of 25)

Page 12: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

The Natural Logarithmic Function

Title: Sep 29 ­ 5:02 AM (12 of 25)

Page 13: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 7Evaluating the Natural Logarithmic Graph

Title: Aug 24 ­ 6:01 PM (13 of 25)

Page 14: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Properties of Natural Logarithms

Inverse Property

One­to­One Property

Title: Sep 29 ­ 5:05 AM (14 of 25)

Page 15: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 8 Using Properties of Natural Logarithms

Title: Aug 24 ­ 6:02 PM (15 of 25)

Page 16: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Properties of Natural Logarithms

Title: Sep 26 ­ 10:12 AM (16 of 25)

Page 17: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 9Finding the Domains of Logarithmic Functions

Find the domain of each function.

Title: Sep 26 ­ 10:04 AM (17 of 25)

Page 18: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Example 10human memory model

Title: Sep 29 ­ 5:10 AM (18 of 25)

Page 19: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Date: 

Classwork:  Computer:

  Homework:     

Lesson 3­2Page 203­204Problems  28, 32, 42, 50, 62, 66

Tuesday, September 29, 2009

Title: Aug 19 ­ 9:03 PM (19 of 25)

Page 20: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______203 28

Title: Sep 25 ­ 4:49 AM (20 of 25)

Page 21: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______203 32

Title: Sep 25 ­ 4:49 AM (21 of 25)

Page 22: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______203 42

Title: Sep 25 ­ 4:49 AM (22 of 25)

Page 23: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______204 50

Title: Sep 25 ­ 4:49 AM (23 of 25)

Page 24: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______204 62

Title: Sep 25 ­ 4:49 AM (24 of 25)

Page 25: Lesson 3.2 Logarithmic Functions and Their Graphs...Lesson 3.2 Logarithmic Functions and Their Graphs Title: Aug 19 9:03 PM (1 of 25) Definition of Logarithmic Function Title: Sep

Homework      page  _____   problem _______204 62

Title: Sep 25 ­ 4:49 AM (25 of 25)