S
ECT
4.2 G
RAPHING
WITH
PHASE
SHIFTS
, V
ERTICAL
E
XPANSIONS
& C
OMPRESSIONS
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I) R
EVIEW
:
Indicate the transformations for each of the following equation:
V.E. by a factor of 3
H.S. 2 units right
V.S. 4 units up
V.E. by a factor of 2
and V.R.
H.S. 3 units left
H.C. by a factor of ½
H.S. 3 units right
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II)
The constant “A” is the amplitude of the function (VE)
The constant “C” indicates the horizontal shift (HS)
The constant “D” indicates the vertical shift (VS)
Ex: Indicate the transformation with each function:
V.E. by a factor of 4
H.S. 2 units right
V.S. 3 units down
V.E. by a factor of 3
and V.R.
H.S. 3 units left
V.S. 8 units up
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III) S
UGGESTIONS
FOR
G
RAPHING
T
RIGONOMETRIC
F
UNCTIONS
Use the constant “d” (vertical shift) to find the middle line
Use the amplitude to find the highest points & lowest points of
the graph
Use the constant “c” (horizontal shift) to find out where the graph
begins
Map out the period from the starting point and divide it into 4
sub-domains
x
y
2
4
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EX: G
RAPH
THE
FOLLOWING
FUNCTION
AND
INDICATE
THE
DOMAIN
,
RANGE
,
AMPLITUDE
,
AND
PERIOD
x
y
-7
-6
-5
-4
-3
-2
-1
1
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P
RACTICE
: G
RAPH
THE
FOLLOWING
FUNCTION
AND
INDICATE
THE
DOMAIN
,
RANGE
,
X
-
INTERCEPTS
,
AMPLITUDE
,
AND
PERIOD
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E
X
: G
IVEN
THE
FOLLOWING
GRAPH
,
FIND
THE
VALUES
OF
A, B, C,
AND
D
FOR
:
x
y
-1
1
2
3
4
5
6
7
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E
X
: I
NDICATE
WHICH
OF
THE
FOLLOWING
EQUATION
IS
THE
CORRECT
ONE
FOR
THE
GRAPH
x
y
-1
1
2
3
First find the vertical displacement “D”
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G
IVEN
THE
COSINE
FUNCTION
,
WHICH
OF
THE
FOLLOWING
IS
THE
CORRECT
R
ANGE
?
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x
y
The Vertical Displacement (Middle Line)
is “S”
The Amplitude is “R”
The Range is then between
“S - R” and “S + R”
H
OMEWORK
:
P245, 248
#1, 3, 19, 21, 22, 23-25, 26
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