HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 188

hp40g+.book Page 6 Friday, December 9, 2005 1:03 AM Num. Factor mode Complex vs. Real mode Verbose vs. nonverbose mode Step-by-step mode Increasing-powers mode Rigorous setting Simplify nonrational setting calculated as closed-form algebraic expressions, whenever possible. [Default: unselected.] When the NUM FACTOR setting is selected, approximate roots are used when factoring. For example, x5 + 5x + 1 is irreducible over the integers but has approximate roots over the reals. With NUM FACTOR set, the approximate roots are returned. [Default: unselected.] 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. 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.] 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.] 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.] 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.] When SIMP NON-RATIONAL is selected, non-rational expressions will be automatically simplified. [Default: selected.] 14-6 Computer Algebra System (CAS)