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№1 слайд![](/documents_6/502da226b8008cdf7017e51cddabc902/img0.jpg)
№2 слайд![Objectives Find the domain of](/documents_6/502da226b8008cdf7017e51cddabc902/img1.jpg)
Содержание слайда: Objectives:
Find the domain of a function.
Combine functions using the algebra of functions, specifying domains.
Form composite functions.
Determine domains for composite functions.
Write functions as compositions.
№3 слайд![Finding a Function s Domain](/documents_6/502da226b8008cdf7017e51cddabc902/img2.jpg)
Содержание слайда: Finding a Function’s Domain
If a function f does not model data or verbal conditions, its domain is the largest set of real numbers for which the value of f(x) is a real number. Exclude from a function’s domain real numbers that cause division by zero and real numbers that result in a square root of a negative number.
№4 слайд![Example Finding the Domain of](/documents_6/502da226b8008cdf7017e51cddabc902/img3.jpg)
Содержание слайда: Example: Finding the Domain of a Function
Find the domain of the function
Because division by 0 is undefined, we must exclude from the domain the values of x that cause the denominator to equal zero.
We exclude 7 and – 7 from the domain of g.
The domain of g is
№5 слайд![The Algebra of Functions Sum,](/documents_6/502da226b8008cdf7017e51cddabc902/img4.jpg)
Содержание слайда: The Algebra of Functions: Sum, Difference, Product, and Quotient of Functions
Let f and g be two functions. The sum f + g, the difference, f – g, the product fg, and the quotient
are functions whose domains are the set of all real numbers common to the domains of f and
defined as follows:
1. Sum:
2. Difference:
3. Product:
4. Quotient:
№6 слайд![Example Combining Functions](/documents_6/502da226b8008cdf7017e51cddabc902/img5.jpg)
Содержание слайда: Example: Combining Functions
Let and Find each of the following:
a.
b. The domain of
The domain of f(x) has no restrictions.
The domain of g(x) has no restrictions.
The domain of is
№7 слайд![The Composition of Functions](/documents_6/502da226b8008cdf7017e51cddabc902/img6.jpg)
Содержание слайда: The Composition of Functions
The composition of the function f with g is denoted
and is defined by the equation
The domain of the composite function is the set of all x such that
1. x is in the domain of g and
2. g(x) is in the domain of f.
№8 слайд![Example Forming Composite](/documents_6/502da226b8008cdf7017e51cddabc902/img7.jpg)
Содержание слайда: Example: Forming Composite Functions
Given and find
№9 слайд![Excluding Values from the](/documents_6/502da226b8008cdf7017e51cddabc902/img8.jpg)
Содержание слайда: Excluding Values from the Domain of
The following values must be excluded from the
input x:
If x is not in the domain of g, it must not be in the domain of
Any x for which g(x) is not in the domain of f must not be in the domain of
№10 слайд![Example Forming a Composite](/documents_6/502da226b8008cdf7017e51cddabc902/img9.jpg)
Содержание слайда: Example: Forming a Composite Function and Finding Its Domain
Given and
Find
№11 слайд![Example Forming a Composite](/documents_6/502da226b8008cdf7017e51cddabc902/img10.jpg)
Содержание слайда: Example: Forming a Composite Function and Finding Its Domain
Given and
Find the domain of
For g(x),
For
The domain of is
№12 слайд![Example Writing a Function as](/documents_6/502da226b8008cdf7017e51cddabc902/img11.jpg)
Содержание слайда: Example: Writing a Function as a Composition
Express h(x) as a composition of two functions:
If and then