Answer
a) $f(4)=16$
The point is (4,16).
b) $x=-4$
The point is (-4, 1/16).
Work Step by Step
a) $f(4)=2^4=16$
The point is (4,16).
b) $\dfrac{1}{16}=2^x$
$\dfrac{1}{2^4}=2^x$
$2^{-4}=2^x$
$x=-4$
The point is (-4, 1/16).