# Chapter 10 - Radical Expressions and Equations - 10-5 Graphing Square Root Functions - Practice and Problem-Solving Exercises - Page 629: 13

$x \leq 18$

#### Work Step by Step

You can not take the square root of a negative number. Therefore, $18 - x$ must be greater than or equal to 0. $18 - x \geq 0$ We subtract 18 from both sides $- x \geq -18$ We divide both sides by -1. *** When we multiply by a negative number we flip the inequality sign. $x \leq 18$

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