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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.

  • 12((-))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).

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