The zero option is used to find an x intercept. While viewing a graph, press .

Press . (The zero option can also be obtained by using the to select option 2 and pressing .)

The question "Lower Bound?" appears at the bottom of the screen. Since a function may have more than one x intercept, specify an interval containing the desired x intercept. The "3" in the upper right-hand corner indicates finding an x intercept on the graph of the third function.

Use the to move the blinking cursor
to the *left* of one of the x intercepts. Press .

The question "Upper Bound?" appears at the bottom of the screen. Use the to move the blinking cursor to the

The coordinates of the x intercept appear at the bottom of the screen. In this case the x intercept is about -6.28.