### Home > CALC > Chapter 1 > Lesson 1.3.1 > Problem1-102

1-102.

Find the domain of the following functions.

1. $f ( x ) = \frac { x - 2 } { x ^ { 2 } + 4 }$

What values of $x$ would make $f(x)$ undefined or imaginary?

When $x^2 + 4 = 0$.

$D = (−∞, ∞)$

1. $g ( x ) = \frac { \sqrt { x + 2 } } { x ^ { 2 } + x }$

What values of $x$ would make $f(x)$ undefined or imaginary?

When $x^2 + x = 0$ and when $x + 2 < 0$.