Texas Instruments Titanium TI-89 User Manual

Symbolic Manipulation 264
Finding Proper Fractions and Common Denominators
Finding Proper Fractions and Common DenominatorsFinding Proper Fractions and Common Denominators
Finding Proper Fractions and Common Denominators
Use the
propFrac („ 7) and comDenom („ 6) functions.
In this example:
Find a proper fraction for the expression
(
x
4
N 2x
2
+x)/ (2x
2
+x+4).
Then transform the answer into a ratio of a
fully expanded numerator and a fully
expanded denominator.
Notice that
propFrac and comDenom perform
opposite operations.
Note: You can use comDenom with an
expression, list, or matrix.
propFrac(rational expression [,var])
for proper fractions with respect
to a variable
comDenom(expression [,var])
for common denominators that collect
similar powers of this variable
If you do this example
on your handheld, the
propFrac function
scrolls off the top of the
screen.

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)