# How do you write the domain

## 3.3: Domain and Range

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## From Graph

When using interval notation, domain and range are written as intervals of values. For f (x) = x2, the domain in interval notation is: D: (-∞, ∞) D indicates that you are talking about the domain, and (-∞, ∞), read as negative infinity to positive
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## Write Domain and Range Given an Equation

Write the domain with proper notation. Writing the domain of a function involves the use of both brackets [,] and parentheses (,). You use a bracket when the number is included in the domain and use a

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## Domain and Range

We can write the domain of f (x) in set builder notation as, {x | x ≥ 0}. If the domain of a function is all real numbers (i.e. there are no restrictions on x), you can simply state the domain as, ‘all real

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## Domain and Range of Rational Functions

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