# Chapter 7 - Section 7.1 - Radical Expressions and Graphs - 7.1 Exercises: 2

F. Not a real number

#### Work Step by Step

We know that $\sqrt -16=4$ is not a real number, because there is no number $a$ such that $a^{2}=-16$. In general, the square root of a negative number is not a real number, because there is no real number that can be squared to create a negative value.

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