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Lesson: Graphs of Log Functions

Lesson: Graphs of Log Functions

Assessment

Presentation

•

Mathematics

•

9th - 12th Grade

•

Practice Problem

•

Medium

Created by

Mr Woods

Used 5+ times

FREE Resource

6 Slides • 10 Questions

1

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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

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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

Question image

Identify the asymptote of the transformed graph log⁡2(x+3)\log_2\left(x+3\right)  shown in red in the graph

1

x=−3x=-3  

2

x=3x=3  

3

y=3y=3  

4

y=−3y=-3  

4

Multiple Choice

Question image

Which of the equations could best describe the graph?

1

log⁡2(x+1)\log_2\left(x+1\right)  

2

log⁡2(x−1)\log_2\left(x-1\right)  

3

log⁡2(x)+1\log_2\left(x\right)+1  

4

log⁡2(x)−1\log_2\left(x\right)-1  

5

Match

Match the following log functions to their horizontal shift (which way will the asymptote shift)

ln⁡(x)\ln\left(x\right)  

ln⁡(x−4)\ln\left(x-4\right)  

ln⁡(x+5)\ln\left(x+5\right)  

No Horizontal Shift

Shift Right

Shift Left

6

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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.

1

x=3x=3  

2

x=−1x=-1  

3

y=1y=1  

4

x=1x=1  

8

Match

Match the following graphs with their domains

Domian: x > -2

Domian: x > 3

Domian: x > 0

Domian: x > 2

9

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10

Graphs of Logarithmic Functions 

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.

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11

Graph of
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12

Multiple Choice

Question image

Identify the domain of the graph

1

Domain: (asymptote, ∞)\left(asymptote,\ \infty\right)  

2

Domain: (−∞, asymptote)\left(-\infty,\ asymptote\right)  

3

Domain: [asymptote, ∞]\left[asymptote,\ \infty\right]  

4

Domain: [−∞, asymptote]\left[-\infty,\ asymptote\right]  

13

Multiple Choice

What is the domain of y=log⁡3(x−3)−2y=\log_3\left(x-3\right)-2  

1

(−∞,∞)\left(-\infty,\infty\right)  

2

(−2,∞)\left(-2,\infty\right)  

3

(3,∞)\left(3,\infty\right)  

4

(−3,∞)\left(-3,\infty\right)  

14

Multiple Choice

What is the domain of y=log⁡3(x−3)−2y=\log_3\left(x-3\right)-2  

1

(−∞,∞)\left(-\infty,\infty\right)  

2

(−2,∞)\left(-2,\infty\right)  

3

(3,∞)\left(3,\infty\right)  

4

(−3,∞)\left(-3,\infty\right)  

15

Multiple Choice

What is the range of y=log⁡3(x−3)−2y=\log_3\left(x-3\right)-2  

1

(−∞,∞)\left(-\infty,\infty\right)  

2

(2,∞)\left(2,\infty\right)  

3

(−2,∞)\left(-2,\infty\right)  

4

(−∞,2)\left(-\infty,2\right)  

16

Multiple Choice

Question image

Classify the following graph.

1

Exponential Growth

2

Exponential Decay

3

Logarithmic

4

Rational

pattern-tertiary
media

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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