HP 50g Quick Start Manual page 32

Table 1- 1 Troubleshooting and FAQ's
Common Problem/Question
Why is my function
returning a wrong answer?
Why is there a dot after my
number?
Why are my symbolic
solutions different than I
expect?
How do I integrate
functions?
Why does the solver only
give me one answer to my
polynomial?
Why do I see choose boxes
instead of soft menus?
What is the symbol above
my screen that won't go
away?
26 Getting Started
Solution
There may be an error in the function, but if everything appears correct, there is probably a number
stored in one of your variables. This variable may be in your current directory or in a higher directory on
your calculator. For example, if X^2 is evaluated while 0 is stored in variable X in a higher directory, the
function becomes 0^2 and returns an unexpected result. To fix the problem, delete the variable. Refer to
the section titled, Memory Management above.
In approximate mode, whole numbers have a decimal to distinguish them from exact integers. Refer to the
previous sections titled, Basic Math and Using the Computer Algebra System (CAS) - Approximate versus
Exact.
Please see the section titled, CAS Troubleshooting in this guide. Also, iff DERVX,INTVX, or
SOLVEVX are not working properly, check that the independent variable name (MODE CAS) is X. There is
a difference between X and x. The calculator is case sensitive.
Use the integration symbol for numeric integration and the command INTVX for symbolic integration.
The numeric solver uses an initial guess and finds the nearest solution. On polynomials and periodic
functions like sine or cosine, changing the initial guess returns a different solution. Refer to the section
titled, Using Equation Solvers in this guide for more information.
The calculator offers both choose boxes and soft key menus. We recommend soft key menus. To turn these
on press MODE, press the FLAGS menu key and set flag1 17 to use Soft menus.
This is usually the low battery warning message, but it also can be one of five other status annunciators.
When the low battery annunciator appears, please change your AAA batteries. Refer to the sections
titled, The Keyboard, Menus, and Annunciators, and Replacing the Batteries (below).