Num Ineq App (fx-CG100 only)

You can use the Num Ineq (Numeric Inequality) app to solve a 2nd, 3rd, or 4th degree inequality.

Operation Flow

Example: To solve $x^{2} + 2 x - \frac{3}{4} \geq 0$

h > Num Ineq

This displays the Degree tab.

On the the Degree tab, select [a2X²‎+‎a1X‎+‎a0], and then press O.

This displays the Type tab.

On the Type tab, select the inequality symbol type and orientation (>, <, ≥, ≤).

Here we want to solve $x^{2} + 2 x - \frac{3}{4} \geq 0$ , select [a2X²‎+‎a1X‎+‎a0‎≥‎0] and then press O.

On the Editor tab that appears, input coefficient values.

1E2Es-(M)3e4E

Press > or E.

This will display the solution on the Result tab. Details about the values in the cell at the current cursor location are shown in the lower-right corner of the window.^*

d

When S > [‎ $\sqrt{} π$ ‎ Result] is turned on, display is in $\sqrt{}$ and $π$ form when possible (decimal form when not possible).
When S > [‎ $\sqrt{} π$ ‎ Result] is turned off, display is in decimal form only.

Note

“No Solution” appears on the Result tab when no solution exists for an inequality (such as $x^{2}$ < 0).

“All Real Values of X ” appears on the Result tab when the solution of an inequality is all numbers (such as $x^{2}$ ≥ 0).

S key operation is ignored on the Result tab. Operate the S key on the Editor tab.