Answer
$A=-4$
Work Step by Step
It is given, that $f(0)=2$.
Substituting $x=0$ into the function $f(x)$ gives:
$f(x)=\dfrac{3(0)+8}{2(0)-A}$
$2=\dfrac{8}{-A}$
Solving this equation for $A$ gives:
$\frac{8}{-A}=2$
$8=2(-A)\\
8=-2A$
$-4=A$