composition of functions!!! objective: i will be able to answer various forms of composition...
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Composition of Functions!!!
Objective: I will be able to answer various forms of composition problems.
If a circle is continuously expanding, how can we measure the area over time?
What is the formula for area of a circle?
2)( rrA
http://www.youtube.com/watch?v=gdTBdyNtHUg&feature=related
So what do we need to know first?
Composition Functions can be denoted:
or
)(xfg fg
gf
or
f(x) is the outside function, and g(x) is the inside function, so the answer of g(x) becomes the input for f(x).
g(x) is the outside function, and f(x) is the inside function, so the answer of f(x) becomes the input for g(x).
)(xgf
If 32)( xxf 2)( xxg and
What will g(f(x)) look like?
x f(x)
-2
0
2
4
6
f(x) g(f(x))
Complete the following tables:
Practice Algebraically
Given the functions:
53)( xxf2)1(2)( xxg
Find these values:
f(4) g(4) f(g(4)) g(f(4)) g(-1) g(f(-1))
Algebraic Challenge:
Find f(g(x)):
2)(
63)(2
xxg
xxf
Partner Practice
• With a partner write two equations
• Label one as f(x) and one as g(x)
• Find various values:– f(g(3))– f(g(-2))– g(f(4))– g(f(-3))