Explanation:
Concept:
For a fraction to be un defined, the value ofthe denominator must be equal to zero
The rtional expression is given below as
[tex]\frac{3x-12}{9-x}=\frac{numerator}{denominator}[/tex]
By applying the concept, we will have that
[tex]\begin{gathered} denominator=0 \\ 9-x=0 \\ x=9 \end{gathered}[/tex]
Hence,
The final answer is
[tex]9[/tex]
OPTION B is the correct answer
