<< Chapter < Page Chapter >> Page >

Reflecting a graph horizontally and vertically

Reflect the graph of s ( t ) = t (a) vertically and (b) horizontally.

  1. Reflecting the graph vertically means that each output value will be reflected over the horizontal t- axis as shown in [link] .

    Graph of the vertical reflection of the square root function.
    Vertical reflection of the square root function

    Because each output value is the opposite of the original output value, we can write

    V ( t ) = s ( t )  or  V ( t ) = t

    Notice that this is an outside change, or vertical shift, that affects the output s ( t ) values, so the negative sign belongs outside of the function.

  2. Reflecting horizontally means that each input value will be reflected over the vertical axis as shown in [link] .

    Graph of the horizontal reflection of the square root function.
    Horizontal reflection of the square root function

    Because each input value is the opposite of the original input value, we can write

    H ( t ) = s ( t )  or  H ( t ) = t

    Notice that this is an inside change or horizontal change that affects the input values, so the negative sign is on the inside of the function.

    Note that these transformations can affect the domain and range of the functions. While the original square root function has domain [ 0 , ) and range [ 0 , ) , the vertical reflection gives the V ( t ) function the range ( , 0 ] and the horizontal reflection gives the H ( t ) function the domain ( , 0 ] .

Got questions? Get instant answers now!
Got questions? Get instant answers now!

Reflect the graph of f ( x ) = | x 1 | (a) vertically and (b) horizontally.

  1. Graph of a vertically reflected absolute function.
  2. Graph of an absolute function translated one unit left.
Got questions? Get instant answers now!

Reflecting a tabular function horizontally and vertically

A function f ( x ) is given as [link] . Create a table for the functions below.

  1. g ( x ) = f ( x )
  2. h ( x ) = f ( x )
x 2 4 6 8
f ( x ) 1 3 7 11
  1. For g ( x ) , the negative sign outside the function indicates a vertical reflection, so the x -values stay the same and each output value will be the opposite of the original output value. See [link] .

    x 2 4 6 8
    g ( x ) –1 –3 –7 –11
  2. For h ( x ) , the negative sign inside the function indicates a horizontal reflection, so each input value will be the opposite of the original input value and the h ( x ) values stay the same as the f ( x ) values. See [link] .

    x −2 −4 −6 −8
    h ( x ) 1 3 7 11
Got questions? Get instant answers now!
Got questions? Get instant answers now!

A function f ( x ) is given as [link] . Create a table for the functions below.

  1. g ( x ) = f ( x )
  2. h ( x ) = f ( x )
x −2 0 2 4
f ( x ) 5 10 15 20
  1. g ( x ) = f ( x )

    x -2 0 2 4
    g ( x ) 5 10 15 20
  2. h ( x ) = f ( x )

    x -2 0 2 4
    h ( x ) 15 10 5 unknown
Got questions? Get instant answers now!

Applying a learning model equation

A common model for learning has an equation similar to k ( t ) = 2 t + 1 , where k is the percentage of mastery that can be achieved after t practice sessions. This is a transformation of the function f ( t ) = 2 t shown in [link] . Sketch a graph of k ( t ) .

Graph of k(t)

This equation combines three transformations into one equation.

  • A horizontal reflection: f ( t ) = 2 t
  • A vertical reflection: f ( t ) = 2 t
  • A vertical shift: f ( t ) + 1 = 2 t + 1

We can sketch a graph by applying these transformations one at a time to the original function. Let us follow two points through each of the three transformations. We will choose the points (0, 1) and (1, 2).

  1. First, we apply a horizontal reflection: (0, 1) (–1, 2).
  2. Then, we apply a vertical reflection: (0, −1) (-1, –2).
  3. Finally, we apply a vertical shift: (0, 0) (-1, -1).

This means that the original points, (0,1) and (1,2) become (0,0) and (-1,-1) after we apply the transformations.

In [link] , the first graph results from a horizontal reflection. The second results from a vertical reflection. The third results from a vertical shift up 1 unit.

Graphs of all the transformations.
Got questions? Get instant answers now!
Got questions? Get instant answers now!

Questions & Answers

what is phylogeny
Odigie Reply
evolutionary history and relationship of an organism or group of organisms
AI-Robot
ok
Deng
what is biology
Hajah Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
what is biology
Victoria Reply
HOW CAN MAN ORGAN FUNCTION
Alfred Reply
the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Precalculus. OpenStax CNX. Jan 19, 2016 Download for free at https://legacy.cnx.org/content/col11667/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Precalculus' conversation and receive update notifications?

Ask