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5
Expression evaluation feature
Press q • to input and calculate an expression. Pressing q • from a
populated home screen expression pastes the content to
If variables
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
Keystrokes and solution:
Press q •.
[If required, press .]
z is a multi-tap key that cycles through
the variables
Continue to press z until
Press l - and enter .
Press * and continue to press z until
appears.
Press * and continue to press z until
appears.
Press n s and enter .
Press n s and enter
Press n s b and enter .
Press n.
=
Substituting
a
2,
−
2
gives
b
4
ac
The discriminant is
Since the discriminant is
rational
intercepts, (
and
are used in the expression, you will be prompted for
and
.
appears.
2
.
=
and
into
b
9
.
.
, there are two
).
.
16
.
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