Weekly Challenge 5: Trigger
To sketch any graph look for:
zeros;
turning points;
asymptotes;
positive values and negative values;
the evaluation of the function at key points, such as $0$, $\pm 1$
or the boundaries of the range or domain of the function (i.e. the
possible input values and max/min output values).
Also, ask yourself: Does the graph vary smoothly from point to
point?