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Characteristics of Log Functions

Characteristics of Log Functions

Assessment

Presentation

•

Mathematics

•

9th - 12th Grade

•

Practice Problem

•

Medium

•
CCSS
HSF-IF.C.7E, 8.F.A.1, HSF.IF.B.5

Standards-aligned

Created by

Erin Inman

Used 49+ times

FREE Resource

5 Slides • 16 Questions

1

​Characteristics of Logarithmic Functions

​Algebra 2

2

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?

​

Graphs of Log Functions

3

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We will focus on what a, h, and k do to affect the parent function

​

​Transformations of Logs

4

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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

​

5

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  

6

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  

7

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

8

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  

9

Multiple Choice

Which graph correctly shows the asymptote of f(x)=log⁡(x+2)+3f(x)=\log(x+2)+3  

1
2
3
4

10

Multiple Choice

Question image

Which function below has a different asymptote than the rest of the functions?

1

a(x)a\left(x\right)  

2

b(x)b\left(x\right)  

3

c(x)c\left(x\right)  

4

d(x)d\left(x\right)  

11

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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​​

12

Match

Match the following graphs with their domains

Domian: x > -2

Domian: x > 3

Domian: x > 0

Domian: x > 2

13

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]  

14

Multiple Choice

Question image

Of the functions shown, which is the ONLY possible function to describe the graph shown?

1

−ln⁡(x+3)-\ln\left(x+3\right)  

2

−ln⁡(x−3)-\ln\left(x-3\right)  

3

−ln⁡(x)−3-\ln\left(x\right)-3  

4

−ln⁡(x)+3-\ln\left(x\right)+3  

15

Multiple Choice

Which of the following has a domain of all real numbers, x > 2 ?

1

y = log2 x

2

y = log3 (x+2)

3

y = log4 (x - 2)

4

y = log7 x - 2

16

Multiple Choice

Which of the following is the sketch of the graph of y = -log3 (x+5) ?

1
2
3
4

17

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)  

18

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)  

19

Multiple Choice

Question image
What is the domain?
1
(-∞, ∞)
2
(0, ∞)
3
[1, ∞)
4
(1, ∞)

20

Multiple Choice

Question image
What is the range?
1
(-∞, ∞)
2
(0, ∞)
3
[1, ∞)
4
(1, ∞)

21

Multiple Choice

Graph ln⁡(x+1)\ln(x+1)  

1
2
3
4
pattern-tertiary
​Characteristics of Logarithmic Functions

​Algebra 2

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