User guide
Mathematics Programs 15–25
Program Lines:
(In RPN mode)
Description
Checksum and length: C7A6 51
Starts fourth–order solution routine.
º
4a
2
.
a
3
.
º
a
3
2
.
.
4a
2
– a
3
2
.
º
a
o
(4a
2
– a
3
2
).
a
1
.
º
a
1
2
.
.
b
0
=a
0
(4a
0
– a
3
2
) – a
1
2
.
!
Stores b
0
.
a
2
.
-+.
b
2
= –a
2
.
!
Stores b
2
.
a
3
.
º
a
3
a
1
.
º
4a
0
.
.
b
1
= a
3
a
1
– 4a
0
.
!
Stores b
1
.
To enter lines D0021 and D0022;
press 4
|
3.
º
ª
-
Creates 7.004 as a pointer to the cubic coefficients.
%
Solves for real root and puts a
0
and a
1
for
second–order polynomial on stack.
¶
Discards polynomial function value.
%
Solves for remaining roots of cubic and stores roots.
%
Gets real root of cubic.
!
Stores real root.