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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?
Trigger
Age 16 to 18
ShortChallenge Level 
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?
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