Texas Instruments MathPrint TI-30X Plus Quick Guide

16
5 Expression evaluation feature
Press q • to input and calculate an expression. Pressing q • from a
populated home screen expression pastes the content to
Expr =
.
If variables
, , , , , ,x y z t a b c
and
d
are used in the expression, you will be prompted for
values or use the stored values displayed for each prompt. The number stored in the
variables will update in TI-30X Plus MathPrint™.
Example
Use the discriminant and the TI-30X Plus MathPrint™ to predict the number and nature of
-x
intercepts for the graph of
2
2 9 5y x x= + −
.
Keystrokes and solution:
Press q •.
[If required, press .]
z is a multi-tap key that cycles through
the variables
, , , , , ,x y z t a b c
and
d
.
Continue to press z until
b
appears.
Press l - and enter
4
.
Press * and continue to press z until
a
appears.
Press * and continue to press z until
c
appears.
Press n s and enter
9
.
Press n s and enter
2
.
Press n s b and enter
5
.
Press n.
Substituting
2, 9ab==
and
5c =−
into
2
4b ac−
gives
( )( )
2
9 4 2 5 121− − =
.
The discriminant is
121
.
Since the discriminant is
2
11
, there are two
rational
-x
intercepts, (
1
5,
2
x =−
).

Texas Instruments MathPrint TI-30X Plus Specifications

General

Brand	Texas Instruments
Model	MathPrint TI-30X Plus
Category	Calculator
Language	English