Question #N113
The function $f(x)$ is defined by $f(x) = \frac{x^2 - 4}{x + 2}$. For what value of $x$ is $f(x)$ undefined?
A. -4
B. -2
C. 2
D. 4
Correct Answer is: B
A rational function is undefined when the denominator is equal to zero. The denominator of $f(x)$ is $x + 2$, which is equal to zero when $x = -2$. Therefore, $f(x)$ is undefined when $x = -2$.