Sharp EL-9900 - Manual (Page 73)

20
Advanced Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Solve the inequality
≤ 2 using the intersection method with shading,
by first pressing Y= CL to clear the Y1 prompt.
2. Enter the left-hand side of the inequality in Y1 by pressing MATH B (NUM)
1 (abs) pressing a/b X/
θ/T/n
1 – X/
θ/T/n x 2 ENTER . Enter 2
in Y2 by pressing 2 ENTER .
3. Press 2ndF DRAW G (SHADE) 1 (SET) 2ndF VARS A ENTER 1 (Y1)
2ndF VARS ENTER 2 (Y2).
4. View the graph by pressing ZOOM A (ZOOM) 7 (Dec).
5. Press 2ndF CALC 2 (Intsct) repeatedly, to locate the x-values of the
points of intersection, x = -1.281, -0.781, 0.781, and 1.281. The solution is all
values of x such that x
≤ -1.281 or -0.781 ≤ x ≤ 0.781 or x ≥ 1.281.
6. Turn off the shading by pressing 2ndF DRAW G (SHADE) 2 (INITIAL).
RATIONAL INEQUALITIES
x
(1 – x 2 )
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