Shifting Graphs - Math
Digital Lesson
Shifting Graphs
The graphs of many functions are transformations of the graphs of very basic functions.
Example: The graph of y = x2 + 3 is the graph of y = x2 shifted upward three units. This is a vertical shift.
The graph of y = -x2 is the reflection of the graph of y = x2 in the x-axis.
y y = x2 + 3
8
y = x2
4
-4 -4
-8
x
4
y = -x2
Copyright ? by Houghton Mifflin Company, Inc. All rights reserved.
2
Vertical Shifts
If c is a positive real number, the graph of f(x) + c is the graph of y = f(x) shifted upward c units.
If c is a positive real number, the graph of f(x) ? c is the graph of y = f(x) shifted downward c units.
y
f(x) + c
+c
f(x)
-c
f(x) ? c
x
Copyright ? by Houghton Mifflin Company, Inc. All rights reserved.
3
Example: Use the graph of f (x) = |x| to graph the functions f (x) = |x| + 3 and f (x) = |x| ? 4.
y
8 4
-4 -4
f (x) = |x| + 3 f (x) = |x|
f (x) = |x| ? 4
x
4
Copyright ? by Houghton Mifflin Company, Inc. All rights reserved.
4
Horizontal Shifts
If c is a positive real number, then the graph of
f (x ? c) is the graph of y = f (x) shifted to the right
c units.
y
If c is a positive real
-c +c
number, then the
graph of f (x + c) is
the graph of y = f (x)
shifted to the left c units.
x y = f (x + c) y = f (x) y = f (x ? c)
Copyright ? by Houghton Mifflin Company, Inc. All rights reserved.
5
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