Learn Before
Example

Determining the Domain of the Radical Function f(x)=3x213f(x) = \sqrt[3]{3x^2 - 1}

To accurately find the domain of the radical function f(x)=3x213f(x) = \sqrt[3]{3x^2 - 1}, observe that the index of the radical is 33, an odd number. Because odd-indexed radicals evaluate to a real number for any real-valued radicand without restrictions, the radicand 3x213x^2 - 1 can be any real number. Consequently, the domain of the entire function includes all real numbers, which is expressed mathematically in interval notation as (,)(-\infty, \infty).

0

1

Updated 2026-05-25

Contributors are:

Who are from:

Tags

OpenStax

Intermediate Algebra @ OpenStax

Ch.8 Roots and Radicals - Intermediate Algebra @ OpenStax

Algebra

Related