HP 40gs - Manual (Page 188)

14-6 Computer Algebra System (CAS)
calculated as closed-form algebraic expressions,
whenever possible. [Default: unselected.]
Num. Factor mode When the
NUM FACTOR
setting is selected, approximate
roots are used when factoring. For example,
is irreducible over the integers but has approximate roots
over the reals. With
NUM FACTOR set, the approximate roots
are returned. [Default: unselected.]
Complex vs. Real
mode When
COMPLEX
is selected and an operation results in a
complex number, the result will be shown in the form a +
bi or in the form of an ordered pair (a,b). If
COMPLEX mode
is not selected and an operation results in a complex
number, you will be asked to switch to
COMPLEX mode. If
you decline, the calculator will report an error. [Default:
unselected.]
When in COMPLEX mode, CAS is able to perform a wider
range of operations than in non-complex (or real) mode,
but it will also be considerably slower. Thus, it is
recommended that you don’t select
COMPLEX
mode unless
requested by the calculator in the performance of a
particular operation.
Verbose vs. non-
verbose mode When VERBOSE is selected, certain calculus applications
are provided with comment lines in the main display. The
comment lines will appear in the top lines of the display,
but only while the operation is being calculated. [Default:
unselected.]
Step-by-step mode When STEP/STEP is selected, certain operations will be
shown one step at a time in the display. You press
to show each step in turn. [Default: selected.]
Increasing-powers
mode When INCR POW is selected, polynomials will be listed so
that the terms will have increasing powers of the
independent variable (which is the opposite to how
polynomials are normally written). [Default: unselected.]
Rigorous setting When
RIGOROUS
is selected, any algebraic expression of
the form |X|, i.e., the absolute value of X, is not
simplified to X. [Default: selected.]
Simplify non-
rational setting When
SIMP NON-RATIONAL
is selected, non-rational
expressions will be automatically simplified. [Default:
selected.]
x
5
5x 1 + +
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