Tutorial Tool Palette

Select New Function from the Work menu.
Type the expression x^3-x^2-16x-10 into the first cell of the Work window. Press the Enter or Return key.
Enter the domain -5 x 5 and click on autoscaling.
Select Plot from the Graph menu.

To zoom-in on the left-most negative root (zero) of the function,

Click on the Zoom tool on the tool palette in the Graph window. It is the first tool on the left. The tool's icon will become highlighted.
Click in the Graph window near the x, y coordinates (-5, 10) and hold down the mouse button. As you drag the mouse, a gray rectangle will be displayed. Move the cursor to a point near the x, y coordinates (-3, -10).
Release the mouse button. The portion of the graph contained in the gray rectangle will be plotted using the entire Graph window. You can now visually estimate the values of the left-most negative root.

To return to the original plot,

Click on the thumb of the scroll bar on the right edge of the Graph and hold down the mouse button.
Drag the thumb to the top end of the scroll bar and release. The original “un-zoomed” plot will be redrawn.

To approximate the roots more accurately,

Click the Single Root Finder tool on the tool palette. It is the eighth tool from the left.
Click in the Graph window near the leftmost root. The value of the root will be calculated and written into the Report window.
Click in the Graph window near the rightmost negative root.