# The Diffe Sub-menu; The Poly Sub-menu - HP F2226A - 48GII Graphic Calculator User Manual

Graphing calculator.

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After solving the two equations, one at a time, we notice that, up to the third
decimal, X is converging to a value of 7.500, while Y is converging to a
value o 0.799.
Using units with the SOLVR sub-menu
These are some rules on the use of units with the SOLVR sub-menu:
Entering a guess with units for a given variable, will introduce the use
of those units in the solution.
If a new guess is given without units, the units previously saved for
that particular variable are used.
To remove units enter a number without units in a list as the new
guess, i.e., use the format { number }.
A list of numbers can be given as a guess for a variable. In this case,
the units takes the units used belong to the last number in the list. For
example, entering { 1.41_ft 1_cm 1_m } indicates that meters (m) will
be used for that variable.
The expression used in the solution must have consistent units, or an
error will result when trying to solve for a value.

## The DIFFE sub-menu

The DIFFE sub-menu provides a number of functions for the numerical solution
of differential equations. The functions provided are the following:
These functions are presented in detail in Chapter 16.

### The POLY sub-menu

The POLY sub-menu performs operations on polynomials. The functions
included are the following:
Page 6-30

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48gii49g+

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