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PRECALCULUS I

Dr. Claude S. Moore Danville Community College

Functions and Graphs

Function, domain, independent variable

Graph, increasing/decreasing, even/odd

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A function f from set A to set B is a rule of correspondence that assigns to each element x in set A exactly one element y in set B.

Set A is the domain (or set of inputs) of the function f, and set B contains range (or set of outputs).

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1. Each element in A (domain) must be matched with an element of B (range).

2. Each element in A is matched to not more than one element in B.

3. Some elements in B may not be matched with any element in A.

4. Two or more elements of A may be matched with the same element of B.

Slide 4

Read f(x) = 3x - 4 as “f of x equals three times x subtract 4.”

x inside parenthesis is the independent variable.

f outside parenthesis is the dependent variable.

For the function f(x) = 3x - 4, f(5) = 3(5) - 4 = 15 - 4 = 11, and f(-2) = 3(-2) - 4 = - 6 - 4 = -10.

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A “piecewise function” defines the function in pieces (or parts).

In the function below, if x is less than or equal to zero, f(x) = 2x - 1; otherwise, f(x) = x2 - 1.

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A function f from set A to set B is a rule of correspondence that assigns to each element x in set A exactly one element y in set B.

Set A is the domain (or set of inputs) of the function f, and set B contains range (or set of outputs).

Definition: Function

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A “piecewise function” defines the function in pieces (or parts).

In the function below, if x is less than or equal to zero, f(x) = 2x - 1; otherwise, f(x) = x2 - 1.

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Generally, the domain is implied to be the set of all real numbers that yield a real number functional value (in the range).

Some restrictions to domain:

1. Denominator cannot equal zero (0).

2. Radicand must be greater than or equal to zero (0).

3. Practical problems may limit domain.

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Go to page:

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- Definition: Function
- Characteristics of a Function
- Functional Notation
- Piece-Wise Defined Function
- Piece-Wise Defined Function
- Domain of a Function
- Domain of a Function
- Summary of Functional Notation
- Vertical Line Test for a Function
- Even and Odd Functions

- Heat-Energy on the Move
- Understanding Heat Transfer, Conduction, Convection and Radiation
- History of Modern Astronomy
- Sound
- Radiation Safety and Operations
- Radiation
- Soil and Plant Nutrition

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