Inequality Calculations
You can use the Inequality app to solve a 2nd, 3rd, or 4th degree inequality.
General Procedure for Performing an Inequality Calculation
Example 1: To solve x2 + 2x - 3 ≥ 0
1. Press 
, select the Inequality app icon, and then press 
.
This displays the number of degrees menu.
2. Select [ax2+bx+c], and then press .
3. On the menu that appears, select the inequality symbol type and orientation (>, <, ≥, ≤).
Here we want to solve x2 + 2x - 3 ≥ 0, select [ax2+bx+c≥0] and then press .
4. On the Coefficient Editor that appears, input coefficient values.
- 1
2
((-))3 
5. Press .
This will display the solution.
To return to the Coefficient Editor while the solution is displayed, press 
, 
, or .
Pressing while the Coefficient Editor is displayed returns to the menu in step 2.
Pressing while the menu in step 2 is displayed returns to the number of degrees menu.
Note
Solutions are displayed as shown in the screen below when something other than MathI/MathO is selected for the Input/Output setting on the SETTINGS menu.
"No Solution" appears on the solution screen when no solution exists for an inequality (such as x2 < 0).
"All Real Numbers" appears on the solution screen when the solution of an inequality is all numbers (such as x2 ≥ 0).
