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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