Re: Dividing Polynomial by a Polynomial ... flaw in TI-89


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Re: Dividing Polynomial by a Polynomial ... flaw in TI-89



No, there is no "flaw" in the TI-89 (at least in this respect).

If the _expression_  (2x^2-3x-1)/(x+2)  is entered, it is displayed as
is, without any simplification (none is possible). However, this is an
improper fraction (the degree of the numerator is equal to or greater
than the degree of the denominator). If you wish to see the result of
dividing the numerator by the denominator, just _store_ this expression,
say in the variable xxx. The command propFrac(xxx)  [from the Algebra
menu] will result in a display of
                    13/(x+2) + 2x - 7

which gives you the desired quotient and remainder.

If this result is also stored in a variable, say yyy, any time that it
is displayed it will remain in this form, which is visually different
from xxx. However, the command  xxx=yyy  results in "true", showing that
these are merely two different forms of the same expression.

The command that is inverse to propFrac()  is  comDenom(), and entering
the command comDenom(yyy) will return the original expression to you.


RWW Taylor
National Technical Institute for the Deaf
Rochester Institute of Technology
Rochester NY 14623

>>>> The plural of mongoose begins with p. <<<<

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