Domain

Definition Of Domain

Domain of a relation is the set of all x-coordinates of the ordered pairs of that relation.

Examples of Domain

Domain of the relation {$3,4$, $9,8$, $4,5$} is {3, 4, 9}.

Video Examples: How to Figure the Domain & Range of Ordered Pairs : Math Tips
 

Solved Example on Domain

Ques: Find the domain of f$x$ = $x + 3$^-1.

Choices:

A. $- ∞, - 3$ or $- 3, - ∞$
B. $- 3, 3$
C. $- ∞, - 3$ or $3, ∞$
D. $- ∞, ∞$
Correct Answer: A

Solution:

Step 1:f$x$ = $x + 3$^-1.
Step 2: 
Step 3: Domain of a function is the set of all possible input values for the function.
Step 4: Observe that the function  is not defined only when x = - 3.
Step 5: So, the domain for this function is $- ∞, - 3$ or $- 3, - ∞$.

Related Worksheet

• Graphing-Linear-Functions-for-a-Given-Domain-Gr-8