# Chapter 7 - Section 7.1 - Radical Expressions and Functions - Concept and Vocabulary Check - Page 511: 3

$[0, +\infty)$

#### Work Step by Step

The number inside a square root sign cannot be negative since negative numbers have imaginary square roots. Thus, the domain of $f(x)=\sqrt{x}$ is $x \ge 0$. In interval notation, the domain is $[0, +\infty)$.

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