Question #N542
The function $f(x) = \frac{x^2 + 3x - 4}{x - 1}$ is undefined for what value of $x$?
A. -1
B. 0
C. 1
D. 4
Correct Answer is: C
A rational function is undefined when the denominator equals zero. In this case, the denominator is $x-1$, which equals zero when $x=1$. Therefore, the function is undefined for $x=1$.