In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
f(x) = - 3^x
Step 02:
if = 1

if = 2

We must continue giving values to make the graph.
Step 03:
Graph
Step 04:
The end behavior of the graph:
as x ----> + oo , f(x) -------> -oo
That is the full solution .