HP 49g Graphing Calculator - Manual (Page 121)

You can also use the SUBST command to substitute expressions. For
example, to substitute the expression y + 2 for x in the previous example:
1. Retrieve the original command from
history and edit it to replace the
substitution value.
® .. ®I) .. ®©®@®Y©2
RAD HVZ HEK C=
imnn______
AL<]
: suest ( ln ( x ^+1 )+RTRN(x>,:^
LN(2^+i)+RTRN<£)
S -^NUMtRNSCi»
2.7i6ES66302£
SURST -»ATAri
VA ')
2. Apply the command.
RAD !-:YZ HEK C=
^H0HE>___
AL>i
L n I.2 +1 J+RTRNi:2?
:
-iff-4UM':RNSi:i»
2-7i6ES6S3022
: SUBS t I.L n ( x ^+ l l+RXRNiXJ/^
LN(i:Y+2/-^+l]-t-RTRH<:Y-h2?
i^»?iaPi?i!imiaE153iiaijm^Lwaa
Expanding and Factorizing
The HP 49G can expand and factorize most algebraic expressions. The
commands that perform these fimctions are in the algebraic category. If
the expression that you are working on contains exponential or
trigonometric functions, you may need to simplify the expression before
using EXPAND or FACTOR. See “Exponential and trigonometric
expressions” on page 5-14.
Expanding expressions
You use the EXPAND command to expand and simplify an expression.
The following example expands the expression:
( x + l ) ( 2 x - 5 ) ( x - 7 )
1. Open the Algebra command list and select
EXPAND to place it on the command line.
2
.
With the cursor between the parentheses,
open Equation Writer and create the
expression. Wlien you have created it,
press (ENTER) to place it on the coiraxiand
line between the parentheses.
RAD KYZ
m \
R= 'H'
■ CHOHEJ
ALQ
EXPfiHDf €
RAD MYZ HEM R= 'K‘ Aia
•EHOMEJ
X+l :i*C 2*X-5 C
> i-7
) )
Working with expressions Page 5-11