# Chapter 6 - Rational Expressions and Equations - 6.1 Rational Expressions - 6.1 Exercise Set - Page 379: 14

$x=-2$

#### Work Step by Step

A rational function is undefined whenever the denominator equals 0. To make the function undefined, set $5x+10$ equal to 0. We can easily see that the value that makes this true is $x = -2$. Find this by subtracting 10 from each side and then dividing by 5.

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