## Tuesday, September 6, 2022

### Casio fx-991EX Classwiz Tips: Solving Inequalities

Casio fx-991EX Classwiz Tips:  Solving Inequalities

This week I am going to show some things that can be done with the Casio fx-991EX Classwiz.

Solving Inequalities

Did you know that the Casio Classwiz can solve inequalities in the forms:

p(x) > 0

p(x) <0

p(x) ≥ 0

p(x) ≤ 0

where p(x) is a polynomial of degree 2 to 4.   The lead coefficient is nonzero.

To get there:  [MENU], [ ° ' " ] (B).

Each inequality and answers are displayed in textbook format.

Examples:

-4x^2 + 8x - 1 < 0

Result:  x < (2 - √3)/2, (2 + √3)/2 < x

-4x^2 + 8x - 1 > 0

Result:  (2 - √3)/2 < x < (2 + √3)/2

3x^4 + 0x^3 - 8x^2 - 6x + 5 ≥ 0

Result:  x≤0.5149391226, 1.8065398762≤x

Eddie

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