Question

Find f(–4) for f(x) = 9(3)x.

Answer 1

Subsitute -4 for x
remember that $x^{-m}=\frac{1}{x^m}$

so
for x=-4
$f(-4)=9(3)^{-4}$
$f(-4)=9(\frac{1}{3^4})$
$f(-4)=9(\frac{1}{81})$
$f(-4)=\frac{9}{81}$
$f(-4)=\frac{1}{9}$
answer is A