Answer
$ f(-1)=\frac{3}{2}$
Work Step by Step
The given function is
$\Rightarrow f(x)=3(2)^x$
Substitute $-1$ for $x$.
$\Rightarrow f(-1)=3(2)^{-1}$
Evaluate the power.
$\Rightarrow f(-1)=3\cdot \frac{1}{2}$
Simplify.
$\Rightarrow f(-1)=\frac{3}{2}$.
