11
Basic Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Turn the calculator on and press Y= . Y prompts will appear on the viewing
window. Press CL to remove old Y expressions. Setup the calculator with
rectangular coordinates and the equation editor mode by pressing 2ndF
SET UP E (COORD) 1 (Rect) G (EDITOR) and 1 (Equation). Press CL
to exit the menu and return to the Y prompts.
2. To enter the polynomial y = –3x
2
+ x + 1, press
(–)
3 x x
2
+
x
+
1 .
3. Press ZOOM A (Zoom) 7 (Dec) to establish the decimal viewing window
and view the graph. Press TRACE to engage the trace feature. Press to
move the cursor near the left-hand root.
4. Press ZOOM A (ZOOM) 3 (In) to zoom in on the left- hand root.
Press TRACE and move the tracer to approximate the root.
5. Press ZOOM G (RCL) 2 (PreWin) to return to the decimal viewing
window. Press TRACE and move the tracer to find the right-hand root.
6. Press ZOOM A (ZOOM) 3 (In) to zoom in. Press TRACE and move the
tracer to approximate the root.
ZOOMING TO FIND ROOTS
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