HP HP-28S - Expanding and Collecting

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