Question about Texas Instruments TI-30 XIIS Calculator

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Re: Quadratic equation

How do I enter a quadratic equation in this calculator. I have tried what I wrote down in class. Sometimes it works, but most of the time it doesn't.
Thank you.

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I like to take the a, b, and c values and store them as variables  -  a->x b->y c->z
then run: (- y + SQRT ( y^2-(4xz) ) )/2x     AND  (- y - SQRT ( y^2-(4xz) ) )/2x

the parentheses may be a bit confusing - 1 holds the whole top of the formula to be divided together, one holds everything under the square root, one holds the -4ac (or -4xz).
That ought to cover it.

Posted on Jan 19, 2009

  • Glen Davis
    Glen Davis Jan 19, 2009

    CORRECTION: Testing reveals a problem. correct process below:


    I like to take the a, b, and c values and store them as variables  -  a->x b->y c->z 
    then run: 



    (- y + SQRT ( y^2-(4xz) ) )/(2x)    




    AND  


    (- y - SQRT ( y^2-(4xz) ) )/(2x)


    the parentheses may be a bit confusing - 1 holds the whole top of the formula to be divided together, one holds everything under the square root, one holds the -4ac (or -4xz). 
    A parentheseis also encloses the bottom of the formula (2a or 2x)

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X*x+bx+c=0

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Ax+by=c

Posted on Jul 31, 2008

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