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4.1 Composite Functions 2011
1
April 18, 2011
4.1 Composite Functions
Objectives: Form and evaluate composite functions. Find the domain of composite functions.
4.1 Composite Functions 2011
2
April 18, 2011
Warmup:Let f(x) = x2 3x, g(x) = 3 + x, h(x) = 2√1 x, k(x) = √x + 3
1. f(4) 2. g(5)
3. h(8) 4. k(22)
4.1 Composite Functions 2011
3
April 18, 2011
Composite functions are what you get when you take the output of one function and use it for the input of the next one.
Given two functions f and g, the composite function, denoted by f g, is defined by:
o
(f g)(x) = f(g(x))o
4.1 Composite Functions 2011
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April 18, 2011
Find (f g)(x)
Let f(x) = x2 3x, g(x) = 3 + x, h(x) = 2√1 x, k(x) = √x + 3
Find (f k)(6)oo
4.1 Composite Functions 2011
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April 18, 2011
Find (f f)(x)oFind (g f)(x)o
Let f(x) = x2 3x, g(x) = 3 + x, h(x) = 2√1 x, k(x) = √x + 3
4.1 Composite Functions 2011
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April 18, 2011
The domain of f g is the set of all numbers x in the domain of g such that g(x) is in the domain of f.
o
4.1 Composite Functions 2011
7
April 18, 2011
Let f(x) = x2 3x, g(x) = 3 + x, h(x) = 2√1 x, k(x) = √x + 3
Find (f h)(x)o Find the domain of (f h)(x)o
4.1 Composite Functions 2011
8
April 18, 2011
Let f(x) = x2 3x, g(x) = 3 + x, h(x) = 2√1 x, k(x) = √x + 3
Find (h k)(x)o Find the domain of (h k)(x)o
4.1 Composite Functions 2011
9
April 18, 2011
Homework:page 254#'s: 10, 1218 (a and b) evens, 30, 32, 34, 40, 48, 49, 54, 55, 61, 62