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Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
Warm UpPlease take out your Domain and Range worksheet
Domain:
Range:
Domain:
Range:
Agenda05 MIN Warm up
5 MIN HW Answers/Questions
20 MIN Lesson
15 MIN Assignment
05 MIN Wrap Up
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
Any Questions on the Domain Range Worksheet?
Stand and Talk
What do you notice? What do you wonder?
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
Did you see a beach with waves or the bottom of a
rusty car door???
Unit 4: Functions
Learning Target: I can write and evaluate the composition of a function
Composition of Functions
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
f(x) = x2 + 1 g(x) = x 3 h(x) = 3x
Find h(2).
Now find f(h(2)).what do you think this means??
Composition of functions:
When the input into one function, f(x), is another function, say g(x).
Notation: f(g(x)) or f o gSo x is the input into the g function, and the value of g(x) is the output.
Then the value of g(x) is the input into the f function, and we get a new output.
This output represents the value of f(g(x)).
These are actually called...
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
Find:
f(g(1)) =
g f(2) =
f(f(3)) =
g g(2) =
o
o
To understand the concept of function composition.... lets look at tables.
x y-1 10 -11 22 23 0
Function f(x)x y-2 3-1 10 11 -12 -2
Function g(x)
Evaluate the following compositions. f(g(6)) g f(7)o f g(7)o f(f(5))
= 7 = 4 O = 7
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
Function Composition from Graphs...
Function f Function g
g(f(6)) =
f g(6) =o
g f(5) =
f(g(4)) =
o
Function Composition from Graphs...
Function f Function g
g(f(6)) =
f g(6) =o
g f(5) =
f(g(4)) =
o
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
f(x) = x2 + 1 g(x) = x 3 h(x) = 3x
Find f(g(5)) =
Find g(f(5)) =
Find f h(2) =o
f(x) = 2x g(x) = x2 + 1
Write the equation of the following compositions:
f(g(x)) =
g(f(x)) =
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
You see, you can really put anything as input into a function.
f(6) =
f( ) =
f(pumpkin) =
f(3x + 5) =
f(x) = x2 + 1
pumpkin
Function Composition from Graphs...Function f Function g
g(f(2)) =
f(g(2)) =
g(f(3)) =
f(g(5)) =
Unit 4 Day 4 and 5 Functions Composition (1).notebook October 24, 2019
k(x) = 3x + 5 j(x) = 6x
Find k j(2) =
Find j k(2) =