HP 38g Graphing Calculator - Manual (Page 69)

Evaluating Expressions
In Aplets In the Symbolic view, a variable is a symbol only, and does
not represent one specific value.
If a variable contains another variable in it, then {{EVAL}}
substitutes it as shown in this example.
In Function Symbolic view,
enter these three expressions.
Highlight F3.
FUNCTION SyHIDLIC MIEH
-^FKX>=R»X''2
F1C-OH-F2'
F4=
F5
{{EVAL}} I FUNCTION fVHEOLIC MIEH
-'FKX>=fl»X -'2
>^F2(X>=B
F4=
F5=
■aata BBrnaiMMBiMgMiiaiiiiii lamw
In Home You can also evaluate any expression in Home by entering it
into the edit line and pressing |
enter
|. For example, in Home
type F3 (X) i ENTER I to evaluate the above expression . This
will fully evaluate the expression, substituting any stored
values for A and B and X.
Plotting and Exploring Functions 3-5