Absolute value inequalities – Sharp EL-9900 User Manual
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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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