# Expanding And Collecting - HP -28S Manual

Advanced scientific calculator.

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Specify the variable you want to isolate.
~X
2:
1:
'A*(X+3)-B=C'
'X§
[liJi]ffiIc::::Jc::::Jc::::Jc::::J
Isolate x, using ISOL (isolate) in the SOLVE menu.
1
SOLV
1
I SOL
r:;:3~:-------------'
2:
1:
' (C+B)/A-3'
H:mImmlHilmI1mllE!I!liElmDD
The expression returned represents a symbolic solution of the equa-
tion for x-that is, the equation
a(x
+
3) -
b
c
is satisfied when
x
(c
+
b)/a -
3.
Expanding and Collecting
If
x occurs more than once, you must manipulate the equation to
eliminate all but one occurrence of
x.
The next example shows how to
isolate
x
in the equation
2(a
+
x)
=
3(b -
x)
+
c.
The strategy for this example is to expand the equation, subtract one
side's x-term from both sides, collect the equation to cancel the x-term
on one side and produce a single x=term on the other side, and then
isolate.
Put the equation on the stack.
~
2
0 ITl
A
[I]
X
.IT]
0
3
0 ITl
B
G
X
.IT] [I]
C
1
ENTER
1
Select the ALGEBRA menu .
1
ALGBRA
1
110
9: Symbolic Solutions

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