Solve - HP 30b - Business Professional Calculator User Manual

Solve

The solve key is not programmable, but it is a powerful addition to the calculator functionality.
The solve function utilizes HP Solve, a feature unique to HP calculators, which allows you to
find a number for a variable that will cause a program to return a 0. This can be used to solve
complex equations.
For example, if you want to solve x
:E<<I
1.
L1:hL1-L2=
2.
(enter program var1
O
3. Press to exit. Store 3 into variable 2 by pressing
:E
and note that Prgrm 2 is selected, as the calculator displays the program
that was last edited. For verification, this program has 1 1 bytes, and the checksum, 199.
:
4. Press (HOLD)
find what value in variable 2 would cause the program to result in 0. In this case, the
result is 27.
5. Now store 10 into variable 2:
program selected in the program menu, you can use the SOLVE feature directly. Press
:
(HOLD)
0. The result this time is 2.506184..., since you stored 10 into variable 2.
6. You can verify this is correct by pressing
see that 10 is returned.
x
-y=0.
(select and edit program 2)
var1
-var2=)
2
to solve for variable 2. The calculator will attempt to
10:$2
1
to solve for variable 1, such that the result of the program is
L1:hL1=
(HOLD)
3:$1
. Since Prgrm 2 was the last
Programming
. Press
and
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