Answer:
[tex]$ \frac{7 +4a}{-6 + 12a} $[/tex]
Step-by-step explanation:
Given: f(x) = [tex]$ \frac{7 + x}{-6 + 3x} $[/tex]
Now to determine f(4a) substitute 4a in the place of x.
⇒ f(4a) = [tex]$ \frac{7 + 4a}{-6 + 3(4a)}[/tex]
⇒ f(4a) = [tex]$ \frac{7 + 4a}{-6 + 12a} $[/tex]
