Texas Instruments TI InterActive! Getting Started Manual page 20

Using a variable
in a calculation
Updating a
variable
20 Getting Started with TI InterActive!
After storing a value in a variable, you can use the variable name
in an expression as a substitute for the stored value.
1. Click the Math Box button
necessary.
2. Type 4*25*num^2 in the Math Box, and press Enter.
TI InterActive! substitutes 517, the value assigned to
evaluates the expression.
3. Type 4*25*nonum^2 in a Math Box, and press Enter.
Because the variable
algebraically in the result.
If you want to update a variable with the result of a calculation,
you must store the result explicitly.
Entry Result
a := 2 2
a^3 8
a 2
a := a^3 8
a 8
a^2 > a 64
a 64
to insert a new Math Box, if
has not been defined, it is treated
nonum
Comment
Result not stored in variable a.
Variable a updated with result.
Variable a updated with result.
, and
num