Function Operations and Composition of Functions. Unit 1 Lesson 6
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1 Function Operations and Composition of Functions Unit 1 Lesson 6
2 Students will be able to: Combine standard function types using arithmetic operations Compose functions Key Vocabulary: Function operation Composition of function Decomposition of Composite Functions Domain of composite function
3 Function Operations Let f and g be any two functions. You can add, subtract, multiply or divide f x and g(x) to form a new function. The domain of new function consist of the x -values that are in the domains of both f x and g(x). When new function involves division, the domain does not include x -values for which the denominator is equal to zero.
4 Operation Definition Addition Subtraction Multiplication f + g f g f g x = f x + g(x) x = f x g(x) x = f x g(x) Division f g f g f x x = g(x) x = f x g(x) where g(x) 0
5 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new a. f x = x 2 + 2x 1 g x = x 5
6 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new a. f x = x 2 + 2x 1 g x = x 5 f + g f + g x = (x 2 +2x 1) + (x 5) x = x 2 + 3x 6 D f9g = (, )
7 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new a. f x = x 2 + 2x 1 g x = x 5 f g f g f g x = (x 2 +2x 1) x 5 x = x 2 + 2x 1 x + 5 x = x 2 + x + 4 D f;g = (, )
8 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new a. f x = x 2 + 2x 1 g x = x 5 f g f g x = (x 2 +2x 1) (x 5) x = x 3 3x 2 11x + 5 D f g =,
9 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new a. f x = x 2 + 2x 1 g x = x 5 f g x = x2 + 2x 1 x 5 D f g = (, 5) (5, )
10 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new b. f x = x 2 81 g x = x + 9
11 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new b. f x = x 2 81 g x = x + 9 f + g f + g x = (x 2 81) + (x + 9) x = x 2 + x 72 D f9g = (, )
12 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new b. f x = x 2 81 g x = x + 9 f g f g f g x = (x 2 81) x + 9 x = x 2 81 x 9 x = x 2 x 90 D f;g = (, )
13 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new b. f x = x 2 81 g x = x + 9 f g f g x = (x 2 81) (x + 9) x = x 3 + 9x 2 81x 729 D f g = (, )
14 Sample Problem 1: : Find f + g x, f g x, f g x, and f g function. x for each f x and g(x). Determine the domain of each new b. f x = x 2 81 g x = x + 9 f x = x2 81 x + 9 D f g = (, 9) ( 9, ) (x + 9)(x 9) = x + 9 g f g = x 9 If the function can be simplified, determine the domain before simplifying!
15 Composition of Functions The composition of function f with function g is defined by (f g) x = f g(x) The domain of the composite function f g is the set of all such that: 1. x is in the domain of g and 2. g x is in the domain of f.
16 x must be in the domain of g x g g x f f(g x ) g x must be in the domain of f
17 Sample Problem 2: Find each composite function. Determine the domain of each composite function. a. f x = 2x 3 g x = x + 1 f g x =? D f g =?
18 Sample Problem 2: Find each composite function. Determine the domain of each composite function. a. f x = 2x 3 g x = x + 1 f g x =? D f g =? f g x = f g x f g x = 2 g x 3 f g x f g x f g x = 2 x = 2x = 2x 1 D f g = (, )
19 Sample Problem 2: Find each composite function. Determine the domain of each composite function. b. f x = x 3 g x = x g f x =? D g f =?
20 Sample Problem 2: Find each composite function. Determine the domain of each composite function. b. f x = x 3 g x = x g f x =? D g f =? g f x = g f x g f x = f x g f x = x D g f = (, ) g f x g f x = x 2 6x = x 2 6x + 10
21 Sample Problem 2: Find each composite function. Determine the domain of each composite function. c. f x = 2 g x = 1 x 3 x f g x =? D f g =?
22 Sample Problem 2: Find each composite function. Determine the domain of each composite function. c. f x = 2 g x = 1 x 3 x f g x =? f g x = f g x f g x 2 = g x 3 f g x = 2 1 x 3 f g x = 2x 1 3x 1 x 0 x x x 1 3
23 Sample Problem 2: Find each composite function. Determine the domain of each composite function. c. f x = 2 g x = 1 D f g =? x 3 x D g = (, 0) (0, ) D f g = (, 0) (0, 1 3 ) (1 3, )
24 Sample Problem 2: Find each composite function. Determine the domain of each composite function. d. f x = 2 x g x = 1 x g f x =? D g f =?
25 Sample Problem 2: Find each composite function. Determine the domain of each composite function. d. f x = 2 g x = 1 x x g f x = g f x g f x = 1 f x 2 x 0 g f x =? x 0 g f x g f x = 1 2 x = x 2
26 Sample Problem 2: Find each composite function. Determine the domain of each composite function. d. f x = 2 x g x = 1 x D g f =? D g = (, 0) (0, ) D g f = (, 0) (0, )
27 Sample Problem 3: : Find and then evaluate each composite function. a. f x = x g x = x 2 f g 6 =?
28 Sample Problem 3: : Find and then evaluate each composite function. a. f x = x g x = x 2 f g 6 =? f g x = f g x f g 6 = 6 2 f g x = g x f g 6 = 4 f g x = x 2 f g 6 = 2
29 Sample Problem 3: : Find and then evaluate each composite function. x + 3 b. f x = 6x 1 g x = g f 2 =? 2
30 Sample Problem 3: : Find and then evaluate each composite function. b. f x = 6x 1 x + 3 g x = 2 g f 2 =? g f x = g f x g f x f x + 3 = 2 g f 2 = g f x (6x 1) + 3 g f 2 = 7 = 2 g f x 6x + 2 2(3x + 1) = = 2 2 g f x = 3x + 1
31 Decomposition of Composite Functions When you form a composite function, you compose two functions to form a new function. It is also possible to reverse this process. You can decompose a given function and express it as a composition of two functions. Although there is more than one way to do this, there is often a natural selection that comes to mind first.
32 Sample Problem 4: Express h x as a composition of two functions f and g f g x. a. h x = x 3 3x 2
33 Sample Problem 4: Express h x as a composition of two functions f and g f g x. a. h x = x 3 3x 2 h x = f g x = f g x f g x = g x 2 = x 3 3x 2 f x = x 2 g x = x 3 3x
34 Sample Problem 4: Express h x as a composition of two functions f and g f g x. b. h x = 3 3x 5
35 Sample Problem 4: Express h x as a composition of two functions f and g f g x. b. h x = 3 3x 5 h x = f g x = f g x f g x = 3 g x 5 = 3 3x 5 f x = 3 x 5 g x = 3x
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