Place the steps to sketch the graph of a rational function in the appropriate
order.
sketch the function's graph, plotting additional points as guides as
needed.
choose test numbers to the left and right of each of these places,
and find the value of the function at each test number.
find the function's zeros and vertical asymptotes, and plot them on a
+ number line.
use test numbers to find where the function is positive and where it
is negative.