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Block 3
Function Graphs
What is to be Learned?
• How to sketch images of given function
graph f(x) under rules such as
 f(x) + 2
 f(x + 2)
 -f(x)
 f(-x)
Will also have peek at y = 2f(x) and y = f(2x)
Handy Graphs To know
f(x) = x2
Handy Graphs To know
f(x) = x3
The Rules
y = f(x)
(-3 , 4)
( 2 , 1)
y = f(x) + 2
(-3 , 6)
( 2 , 3)
2
The Rules
y = f(x)
(-3 , 4)
( 2 , 1)
y = f(x – 2)
(-1 , 4)
( 4, 1)
2
The Rules
y = f(x)
(-3 , 4)
( 2 , 1)
y = -f(x)
(-3 , -4)
( 2, -1)
Reflects in
x axis
The Rules
y = f(x)
(-3 , 4)
( 2 , 1)
y = f(-x)
(3 , 4)
( -2, 1)
Reflects in
y axis
Y = 2f(x) and y = f(2x)
Remember Trig Graphs
f(x) = sinx
f(x) = 2sinx
Graph “stretches”
Y = 2f(x) and y = f(2x)
Remember Trig Graphs
f(x) = sinx
f(x) = sin2x
Graph Squashes
Function Graph Families
Given graph y = f(x) we can sketch family
graphs by following these rules
y = f(x) – 2
y = f(x + 2)
y = -f(x)
y = f(-x)
y =2f(x)
y = f(2x)
2 down
2 to left
reflects in x axis
reflects in y axis
stretches
squashes
*
*
* Think of trig graphs
sketch y = 3 – f(x)
y = f(x)
Ex
(3 , -1)
2
Cunningly change to y = -f(x) + 3
(3 , 1)
-2
y = -f(x)
y = -f(x) + 3
(3 , 4)
1
y = f(x)(-2 , 5)
( 1 , 2)
y = f(x – 2)
(0 , 5)
(3 , 2)
Key Question
Sketch y = f(x – 2) + 1 showing new key points
y = f(x – 2) + 1
(0 , 6)
(3 , 3)

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Function graphs

  • 2. What is to be Learned? • How to sketch images of given function graph f(x) under rules such as  f(x) + 2  f(x + 2)  -f(x)  f(-x) Will also have peek at y = 2f(x) and y = f(2x)
  • 3. Handy Graphs To know f(x) = x2
  • 4. Handy Graphs To know f(x) = x3
  • 5. The Rules y = f(x) (-3 , 4) ( 2 , 1) y = f(x) + 2 (-3 , 6) ( 2 , 3) 2
  • 6. The Rules y = f(x) (-3 , 4) ( 2 , 1) y = f(x – 2) (-1 , 4) ( 4, 1) 2
  • 7. The Rules y = f(x) (-3 , 4) ( 2 , 1) y = -f(x) (-3 , -4) ( 2, -1) Reflects in x axis
  • 8. The Rules y = f(x) (-3 , 4) ( 2 , 1) y = f(-x) (3 , 4) ( -2, 1) Reflects in y axis
  • 9. Y = 2f(x) and y = f(2x) Remember Trig Graphs f(x) = sinx f(x) = 2sinx Graph “stretches”
  • 10. Y = 2f(x) and y = f(2x) Remember Trig Graphs f(x) = sinx f(x) = sin2x Graph Squashes
  • 11. Function Graph Families Given graph y = f(x) we can sketch family graphs by following these rules y = f(x) – 2 y = f(x + 2) y = -f(x) y = f(-x) y =2f(x) y = f(2x) 2 down 2 to left reflects in x axis reflects in y axis stretches squashes * * * Think of trig graphs
  • 12. sketch y = 3 – f(x) y = f(x) Ex (3 , -1) 2 Cunningly change to y = -f(x) + 3 (3 , 1) -2 y = -f(x) y = -f(x) + 3 (3 , 4) 1
  • 13. y = f(x)(-2 , 5) ( 1 , 2) y = f(x – 2) (0 , 5) (3 , 2) Key Question Sketch y = f(x – 2) + 1 showing new key points y = f(x – 2) + 1 (0 , 6) (3 , 3)