Root Option

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

Press to obtain the root option.

Since a function may have more than one x intercept, specify an interval containing the desired x intercept. The question "LeftBound?" appears at the bottom of the screen. Use the to move the bliniking cursor to the left of the desired x intercept. Press .

The question "RightBound?" appears at the bottom of the screen. Use the to move the bliniking cursor to the right of the desired x intercept. Press .

The question "Guess?" appears at the bottom of the screen. Move the bliniking cursor close to the desired x intercept. Press .

The coordinates of the x intercept appear at the bottom of the screen. In this case the x intercept is about 2.28. Notice the y coordinate is given in scientific notation. The value of y is approximately zero.