Question #N314
If $f(x) = \frac{x^2 - 2x}{x - 1}$, for what value of $x$ is $f(x)$ undefined?
A. -1
B. 0
C. 1
D. 2
Correct Answer is: C
A rational function is undefined when the denominator is equal to zero. In this case, the denominator is $x - 1$, so $f(x)$ is undefined when $x - 1 = 0$, or $x = 1$.