Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
08-26-2023, 08:38 AM
Post: #1
 Matt Agajanian Senior Member Posts: 1,029 Joined: Dec 2013
Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
Hi all.

My memory must be going. How can I define f(x) and g(x) and then evaluate expressions like 3f(15)^2+9f(2.5)? I know that TABLE lets you define f(x) and g(x). It doesn’t seem I can call up the f( and g( operations outside of TABLE mode or am I missing a step or a few?

Your help is greatly appreciated. Thank you.
08-26-2023, 02:04 PM
Post: #2
 klesl Member Posts: 140 Joined: Mar 2016
RE: Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
the 1st option:
type your function to calculator with stored variables
change and store your variables
use replay command (the up arrow) and evaluate your function again
the 2nd option:
08-26-2023, 11:11 PM (This post was last modified: 08-26-2023 11:52 PM by Matt Agajanian.)
Post: #3
 Matt Agajanian Senior Member Posts: 1,029 Joined: Dec 2013
RE: Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
(08-26-2023 02:04 PM)klesl Wrote:  the 1st option:
type your function to calculator with stored variables
change and store your variables
use replay command (the up arrow) and evaluate your function again
the 2nd option:

Okay. From what you’re saying:l

Example: f(g(x))
1--Store variables.
2--Enter g(x).
3-Evaluate.
4--Store result in x.
5-Enter f(x)
6--Evaluate

Now that f(x) and g(x) are in the history stack,
A--Store new value
B--R↑ history stack to g(x) and evaluate.
C--store result in x.
D--R↑ history stack to f(x) and evaluate.

Repeat Steps A-D

R↑?? I couldn't resist.
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