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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