Answer
$(-1,\dfrac{1}{a}), (0,1), (1,a)$
Work Step by Step
We must recall the following properties:
$(a) \ a^{-1}=\dfrac{1}{a} \\(b) \ a^0=1 \\ (c) \ a^{(1)}=a$
We see that the graph of any exponential function $f(x)=a^x$ will pass through the following points:
$(-1,\dfrac{1}{a}), (0,1), (1,a)$
