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HP -28S Manual Page 257

Advanced scientific calculator.
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Program
<~
E~-(PAt~
:"
t'WL T I
,,:: COLCT
"
t'WL TI
I
ENTER
I
c::] EXCO
I
STO
I
Comments
Begin the program.
Put EXPAN on the stack.
Execute EXPAN until the alge-
braic object doesn't change.
Put COLCT on the stack.
Execute COLCT until the alge-
braic object doesn't change.
End the program.
Put the program on the stack.
Store the program as EXCO.
Example. Expand and collect completely the expression
3x (4y
+
z)
+
(8x -
5z)2.
Enter the expression.
I
USER
I
c::]30X0
[D
4
0
Y
G
z
.rn
G
[D
8
0
X
G
5
0
Z
.rn
.~
2
I
ENTER
I
Expand and collect completely.
EXCO
Expressions with many products of sums or with powers can take
many iterations of EXPAN to expand completely, resulting in a long
execution time for EXCO.
256
28: Programming Examples

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