For this case, we have by definition the domain of a function is given by all the values for which the function is defined.
We have the function:
[tex]f (x) = \frac {3x} {x-1}[/tex]
It is not defined when the denominator is 0. This is when:
[tex]x-1 = 0\\x = 0 + 1\\x = 1[/tex]
Thus, the domain of the function is given by all the real numbers minus the 1.
Answer:
Option C
