Connecting...

This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Calculus AB

Calculus AB Logarithmic Functions

Section 1: Functions: Lecture 9 | 7:08 min

Lecture Description

Next Lecture

Previous Lecture

Discussion
Answer Engine
Study Guides
Practice Questions
Download Lecture Slides
Table of Contents
Related Books

Lecture Comments (5)

	0 answers Post by Adina Tung on April 27, 2018 For example 2, shouldn't x=-4 "not" be one of the solution? From the expression: ln(x+2) + ln(x+3) = ln(3x+14), we know that X+2>0, x+3>0, 3x+14>0, so X>-2, that's how I get that "x=2" is the only solution.
	0 answers Post by Kwan Ling Cheung on August 19, 2017 The question of Q10 (i.e. the last question) in Practice Questions should be: logb(x) = (loga(x)) / (loga(b)) NOT logb(x) = (loga(x)) / (logb(x))
	1 answer Last reply by: Kwan Ling Cheung Sat Aug 19, 2017 3:31 AM Post by Kwan Ling Cheung on August 19, 2017 For Q6 in Practice Questions, the question should be: Solve for x, log2(x) ? log2(x^[1/3]) = 8. NOT log2(x^2) ? log2(x^[1/3]) = 8.
	0 answers Post by Akeel Howell on June 18, 2015 How do logarithms relate to taking derivatives and integrals?

Answer EngineGet answers to any question!Ask any question related to Calculus AB

Working on the solution...

Logarithmic Functions

Given y = log_1234567(541), find 1234567^y

y = log_1234567(541)
1234567^y = 1234567^{log_1234567(541)}
1234567^y = 541

1234567^y = 541

Solve for x, ln(x³) = 1

ln(x³) = 1
3ln(x) = 1
ln(x) = [1/3]
e^ln(x) = e^[1/3]
x = e^[1/3]

x = e^[1/3]

Simplify log_b(2⁵) − log_b(2⁴)

log_b(2⁵) − log_b(2⁴) = log_b([(2⁵)/(2⁴)]) = log_b(2)

Solve for x, x = log_y(y)

x = log_y(y)
y^x = y^log_y(y)
y^x = y = y¹

x = 1

Solve for y, ln([x/y]) = 0

ln([x/y]) = 0
ln(x) − ln(y) = 0
ln(x) = ln(y)
e^ln(x) = e^ln(y)
x = y

y = x

Solve for x, log₂(x²) − log₂(x^[1/3]) = 8

log₂(x) − log₂(x^[1/3]) = 8
log₂([x/(x^[1/3])]) = 8
log₂(x^{1 − [1/3]}) = 8
log₂(x^[2/3]) = 8
[2/3]log₂(x) = 8
log₂(x) = 12
x = 2¹² = 4096

4096

Solve for x, x = log_1234567(1)log(99999999999999)

log_b (1) = 0

x = log_1234567(1)log(99999999999999) = 0 * log(99999999999999) = 0

Simplify e^{ln(x) + 2}

e^{ln(x) + 2} = e^ln(x)e² = x(e²)
Here, the base is irrelevant. log_b(1) = 0

Solve for x, ln(x + 8) + ln(x) − ln(9) = 0

ln(x + 8) + ln(x) − ln(9) = 0
ln([((x + 8) x)/9]) = 0
ln([(x² + 8x)/9]) = 0
[(x² + 8x)/9] = e⁰
[(x² + 8x)/9] = 1
x² + 8x = 9
x² + 8x − 9 = 0
v(x + 9) (x − 1) = 0
x = 1, −9
The second solution, -9, would be outside of the domain of lnx. For lnx, x must be greater than 0. So x = 1

x = 1

Prove log_b(x) = [(log_a(x))/(log_b(x))]

Let y = log_b(x) and z = log_a(x)
y = log_b(x)
b^y = x
z = log_a(x)
z = log_a(b^y)
z = ylog_a(b)
z = log_b(x)log_a(b)
log_a(x) = log_b(x)log_a(b)
log_b(x) = [(log_a(x))/(log_a(b))]

log_b(x) = [(log_a(x))/(log_a(b))]

« Previous Question | Next Question »

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

Logarithmic Functions

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Intro

Types of Functions: Logarithmic

Logarithmic & Exponential Relationship

Log form

Properties

Example 1: Apply Basic Principle of Log Func.

Example 2: Use Properties

Example 3: Regular Log

Intro 0:00
Types of Functions: Logarithmic 0:06

General Form
2 Special Logarithmic Func.
Euler's # / Natural Log

Logarithmic & Exponential Relationship 0:45

Log form

Properties 2:09
Example 1: Apply Basic Principle of Log Func. 3:05
Example 2: Use Properties 3:40
Example 3: Regular Log 5:16

Mathematics: AP Calculus AB

Section 1: Functions
	Definitions & Properties of Functions	11:26
	Graphing	13:58
	Inverse Functions	6:47
	Polynomial Functions	5:04
	Trigonometric Functions	6:45
	Inverse Trigonometric Functions	5:58
	Trigonometric Identities	17:42
	Exponential Functions	5:53
	Logarithmic Functions	7:08
	Rational Functions	15:36
	Conic Sections	14:58
Section 2: Limits and Continuity
	Limit Definition & Properties	7:15
	Solving Limits with Algebra	8:01
	Rational Limit Rules	3:16
	One Sided Limits	9:57
	Special Trigonometric Limits	8:28
	Limits & Continuity	10:14
	Limits: Multiple Choice Practice	6:16
Section 3: Derivatives
	Derivative Definition & Properties	4:11
	Basic Rules of Differentiation	7:07
	Power Rule	7:14
	Trigonometric Rules	7:53
	Product Rule	11:11
	Quotient Rule	16:50
	Chain Rule	19:48
	Higher Order Derivatives	15:00
	Derivatives of Exponential Functions	13:14
	Derivatives of Logarithmic Functions	11:30
	Derivatives of Inverse Trigonometric Functions	16:54
	Implicit Differentiation	16:53
	Multiple Choice Practice: Derivatives	11:07
Section 4: Applications of Derivatives
	Tangent & Normal Lines	22:36
	Position Velocity & Acceleration	18:42
	Related Rates	26:22
	Minimum & Maximum	12:22
	Concavity	11:43
	Rolles Theorem	8:28
	Mean Value Theorem	9:39
	Differentials	12:25
	Applications of Derivatives: Multiple Choice Practice	13:21
	Applications of Derivatives: Free Response Practice	10:22
Section 5: Integrals
	Definition of Integrals	1:08
	Integrals of Power Rule	8:50
	Integrals Basic Rules of Integration	9:43
	Trigonometric Rules of Integrals	8:58
	Chain Rule	13:59
	Integrals of Exponential Functions	12:52
	Integrals of Natural Logarithmic Functions	13:00
	Integrals of Inverse Trigonometric Functions	8:29
	Integrals: Multiple Choice Practice	15:37
Section 6: Applications of Integrals
	Fundamental Theorem of Calculus	15:55
	Area Under A Curve	18:34
	Reimann Sums	10:35
	Trapezoid Rule	12:46
	Mean Value Theorem	11:22
	Second Fundamental Theorem of Calculus	4:44
	Area Between Curves	16:39
	Revolving Solids Washer Disk Methods	21:09
	Revolving Solids Cylindrical Shells Method	26:46
	Revolving Solids Known Cross Sections	27:41
	Differential Equations Eulers Method	17:54
	Differential Equations Slope Fields	16:30
	Application of Integrals: Multiple Choice Practice	14:19
	Application of Integrals: Free Response Practice	9:14
Section 7: Sample AP Test
	AP Calculus AB Practice test: Section 1: Multiple Choice Part 1	17:50
	AP Calculus AB Practice test: Section 1: Multiple Choice Part 2	17:32
	AP Calculus AB Practice test: Section 1: Multiple Choice Part 3	22:14
	AP Calculus AB Practice test: Section 1: Multiple Choice Part 4	19:35
	AP Calculus AB Practice test: Section 1: Multiple Choice Part 5	25:43
	AP Calculus AB Practice Test: Section 2: Free Response Part 1	16:50
	AP Calculus AB Practice Test: Section 2: Free Response Part 2	21:36
	AP Calculus AB Practice Test: Section 2: Free Response Part 3	13:39

Related Books

	Cracking the AP Calculus AB Exam, 2015 Edition Author: Princeton Review ISBN: 804124809 Publisher: Princeton Review Year: 2014 The book includes 3 full length practice tests with detailed explanations, a review of all the key concepts, and targeted strateeies to ace th exam for your highest score.
	Cliffs AP: Calculus AB & BC, 3rd Edition Authors: Dale W Johnson, Kerry J King ISBN: 764586831 Publisher: Cliffs Notes Year: 2001 The book has a topic-by topic breakdown and lots of problem approach suggestions for both free response and multiple choice calculus questions. The book also includes two full length tests.

Related Books

Name	Description	Link
BookRenter.com	BookRenter.com is simply the most reliable online textbook rental service.	Visit BookRenter.com
PhysicsForums.com Homework Help	Physics Forums is a scientific community for students looking for math & science help.	Visit PhysicsForums.com Homework Help

John Zhu

Logarithmic Functions

Slide Duration:

Table of Contents

Section 1: Functions

Definitions & Properties of Functions

11m 26s

Intro