EXPONENTIAL FUNCTIONS Graphing And Analysis (Page 3 of 5)

To find the x-intercept (the zero), use the CALC zero command. You will need to answer three questions during this process. To set the Left Bound, enter any value of x near but a little to the left of the x-intercept. The Right Bound can be any value of x near but a little to the right of the x-intercept. For the Guess, use a value of x that is close to the intercept itself.

 2nd CALC key. 2: menu selection. 0 ENTER key. 1 ENTER key. 0.5 ENTER key. Calculator screen image.

When the calculator asks each question, the graph is put into trace mode. Just type in the value of x you want, and a prompt will appear as you do. We used a left bound of 0, a right bound of 1, and a guess of 0.5. Make sure the x-values you enter when answering these questions are valid for the current window (between Xmin and Xmax). The coordinates of the zero are then displayed.
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