<< Chapter < Page Chapter >> Page >

Given a function and both a vertical and a horizontal shift, sketch the graph.

  1. Identify the vertical and horizontal shifts from the formula.
  2. The vertical shift results from a constant added to the output. Move the graph up for a positive constant and down for a negative constant.
  3. The horizontal shift results from a constant added to the input. Move the graph left for a positive constant and right for a negative constant.
  4. Apply the shifts to the graph in either order.

Graphing combined vertical and horizontal shifts

Given f ( x ) = | x | , sketch a graph of h ( x ) = f ( x + 1 ) 3.

The function f is our toolkit absolute value function. We know that this graph has a V shape, with the point at the origin. The graph of h has transformed f in two ways: f ( x + 1 ) is a change on the inside of the function, giving a horizontal shift left by 1, and the subtraction by 3 in f ( x + 1 ) 3 is a change to the outside of the function, giving a vertical shift down by 3. The transformation of the graph is illustrated in [link] .

Let us follow one point of the graph of f ( x ) = | x | .

  • The point ( 0 , 0 ) is transformed first by shifting left 1 unit: ( 0 , 0 ) ( −1 , 0 )
  • The point ( −1 , 0 ) is transformed next by shifting down 3 units: ( −1 , 0 ) ( −1 , −3 )
Graph of an absolute function, y=|x|, and how it was transformed to y=|x+1|-3.

[link] shows the graph of h .

The final function y=|x+1|-3.
Got questions? Get instant answers now!
Got questions? Get instant answers now!

Given f ( x ) = | x | , sketch a graph of h ( x ) = f ( x 2 ) + 4.

Graph of h(x)=|x-2|+4.
Got questions? Get instant answers now!

Identifying combined vertical and horizontal shifts

Write a formula for the graph shown in [link] , which is a transformation of the toolkit square root function.

Graph of a square root function transposed right one unit and up 2.

The graph of the toolkit function starts at the origin, so this graph has been shifted 1 to the right and up 2. In function notation, we could write that as

h ( x ) = f ( x 1 ) + 2

Using the formula for the square root function, we can write

h ( x ) = x 1 + 2
Got questions? Get instant answers now!
Got questions? Get instant answers now!

Write a formula for a transformation of the toolkit reciprocal function f ( x ) = 1 x that shifts the function’s graph one unit to the right and one unit up.

g ( x ) = 1 x - 1 + 1

Got questions? Get instant answers now!

Graphing functions using reflections about the axes

Another transformation that can be applied to a function is a reflection over the x - or y -axis. A vertical reflection reflects a graph vertically across the x -axis, while a horizontal reflection reflects a graph horizontally across the y -axis. The reflections are shown in [link] .

Graph of the vertical and horizontal reflection of a function.
Vertical and horizontal reflections of a function.

Notice that the vertical reflection produces a new graph that is a mirror image of the base or original graph about the x -axis. The horizontal reflection produces a new graph that is a mirror image of the base or original graph about the y -axis.

Reflections

Given a function f ( x ), a new function g ( x ) = f ( x ) is a vertical reflection    of the function f ( x ) , sometimes called a reflection about (or over, or through) the x -axis.

Given a function f ( x ) , a new function g ( x ) = f ( x ) is a horizontal reflection    of the function f ( x ) , sometimes called a reflection about the y -axis.

Given a function, reflect the graph both vertically and horizontally.

  1. Multiply all outputs by –1 for a vertical reflection. The new graph is a reflection of the original graph about the x -axis.
  2. Multiply all inputs by –1 for a horizontal reflection. The new graph is a reflection of the original graph about the y -axis.

Questions & Answers

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
cell is the building block of life.
Condoleezza Reply
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, Algebra and trigonometry. OpenStax CNX. Nov 14, 2016 Download for free at https://legacy.cnx.org/content/col11758/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

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

Ask