Sharp EL9900 manual 1Move the tracer near the left-hand root

EL-9900 Graphing Calculator

Step & Key Operation Display Notes

2-1Move the tracer near the left-hand root.

TRACE (repeatedly)

2-2Zoom in on the left-hand root.

ZOOM A 3

Tracer

Note that the tracer is flashing on the curve and the x and y coordinates are shown at the bottom of the screen.

Tracer

2-3Move the tracer to approximate the root.

TRACE or (repeatedly)

3-1Return to the previous decimal viewing window.

ZOOM H

2

3-2Move the tracer to approximate the middle root.

TRACE (repeatedly)

4 Move the tracer near the right- hand root.

Zoom in and move the tracer to find a better approximate.

(repeatedly)

ZOOM A 3

TRACE or (repeatedly)

The root is : x -0.42

Tracer

The root is exactly x = 1. (Zooming is not needed to find a better approximate.)

Tracer

The root is : x 2.42

The calculator allows the roots to be found (or approximated) visually by graphing a polynomial and using the Zoom-in and Trace features.

6-1