# Chapter 7 - Section 7.1 - Radical Expressions and Graphs - 7.1 Exercises: 54

19

#### Work Step by Step

For any real number $a$, $\sqrt (a^{2})=|a|$. That is, the principal square root of $a^{2}$ is the absolute value of $a$. Therefore, $\sqrt (19^{2})=|19|=19$.

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