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Advanced Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. To solve < 8 , rewrite the inequality so that the right-hand side
of the inequality is zero: – 8 < 0.
2. Press Y= and clear all the Y prompts.
3. Enter the left-hand side of the inequality – 8 in Y1 by pressing
MATH B (NUM) 1 (abs) a/b 2 0 – 6 X/θ/T/n 5
–
8 .
4. Graph the expression by pressing ZOOM A (Zoom) 5 (Default).
The x-intercepts of the graph are clearly visible.
5. Press 2ndF CALC 5 (X_Incpt) to find the first x-intercept. Press 2ndF
CALC 5 (X_Incpt) to find the second x-intercept.
6. Since the graph is below the x-axis for x in between the two x-intercepts,
the solution is
-
3.33 < x < 10.
ABSOLUTE VALUE INEQUALITIES
20 – 6x
5
20 – 6x
5
20 – 6x
5
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