

Lesson: Graphs of Log Functions
Presentation
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Medium
Mr Woods
Used 5+ times
FREE Resource
6 Slides • 10 Questions
1
Logs are the inverse of Exponential Functions--their graphs are inverted
2x is in red
log2 x is in blue
Notice the asymptotes?
What else has switched?
Lesson: Graphs of Log Functions
2
The parent graph, log2(x)
The transformed graph,
log2(x+3)
Which way did the graph move? Where is the asymptote?
what is the h-value for the red graph?
The asymptote, h
3
Multiple Choice
Identify the asymptote of the transformed graph log2(x+3) shown in red in the graph
x=−3
x=3
y=3
y=−3
4
Multiple Choice
Which of the equations could best describe the graph?
log2(x+1)
log2(x−1)
log2(x)+1
log2(x)−1
5
Match
Match the following log functions to their horizontal shift (which way will the asymptote shift)
ln(x)
ln(x−4)
ln(x+5)
No Horizontal Shift
Shift Right
Shift Left
No Horizontal Shift
Shift Right
Shift Left
6
Domain: x > -2
h will affect the domain of log functions
Remember: can't take the log of ZERO or NEGATIVE arguments
The vertical asymptote is either the left or right boundary of domain
7
Multiple Choice
Identify the asymptote for the function ℎ(𝑥) = 𝑙𝑛(𝑥 − 1) + 3.
x=3
x=−1
y=1
x=1
8
Match
Match the following graphs with their domains
Domian: x > -2
Domian: x > 3
Domian: x > 0
Domian: x > 2
Domian: x > -2
Domian: x > 3
Domian: x > 0
Domian: x > 2
9
10
To sketch the graph y = loga x, you can use the fact that the graphs of inverse functions are reflections of each other in the line y = x.
11
12
Multiple Choice
Identify the domain of the graph
Domain: (asymptote, ∞)
Domain: (−∞, asymptote)
Domain: [asymptote, ∞]
Domain: [−∞, asymptote]
13
Multiple Choice
What is the domain of y=log3(x−3)−2
(−∞,∞)
(−2,∞)
(3,∞)
(−3,∞)
14
Multiple Choice
What is the domain of y=log3(x−3)−2
(−∞,∞)
(−2,∞)
(3,∞)
(−3,∞)
15
Multiple Choice
What is the range of y=log3(x−3)−2
(−∞,∞)
(2,∞)
(−2,∞)
(−∞,2)
16
Multiple Choice
Classify the following graph.
Exponential Growth
Exponential Decay
Logarithmic
Rational
Logs are the inverse of Exponential Functions--their graphs are inverted
2x is in red
log2 x is in blue
Notice the asymptotes?
What else has switched?
Lesson: Graphs of Log Functions
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