For this case we have the following expression:
[tex]\frac {2x-4} {x-5}[/tex]
By definition, we have the expression undefined when the denominator is 0.
So:
[tex]x-5 = 0[/tex]
Adding 5 to both sides of the equation:
[tex]x-5 + 5 = 5\\x = 5[/tex]
Thus, the expression is undefined when [tex]x = 5.[/tex]
Answer:
Option B
