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Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
08-26-2023, 08:38 AM
Post: #1
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.
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08-26-2023, 02:04 PM
Post: #2
RE: Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
the 1st option:
store your variables
type your function to calculator with stored variables
evaluate your function
change and store your variables
use replay command (the up arrow) and evaluate your function again
the 2nd option:
use spreadsheet
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08-26-2023, 11:11 PM (This post was last modified: 08-26-2023 11:52 PM by Matt Agajanian.)
Post: #3
RE: Please forgive my amnesia. Entering “f(x)” on Casio fx-991EX
(08-26-2023 02:04 PM)klesl Wrote:  the 1st option:
store your variables
type your function to calculator with stored variables
evaluate your function
change and store your variables
use replay command (the up arrow) and evaluate your function again
the 2nd option:
use spreadsheet

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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