Algb Menu - HP 40gs User Manual

hp40g+.book Page 10 Friday, December 9, 2005 1:03 AM

ALGB menu

COLLECT
DEF
14-10
For example, suppose you have stored the expression x
in G, and have defined the function F(x) as x
now you want to calculate INTVX(X
2
•
enter INTVX(X ) directly, or
•
enter INTVX(G), or
•
enter INTVX(F(X)).
Note that you can apply the command directly to an
expression or to a variable that holds an expression (the
first two cases above). But where you want to apply it to
a defined function, you need to specify the full function
name, F(X), as in the third case above.
Factors over the integers
COLLECT combines like terms and factors the expression
over the integers.
Example
2
x – 4
To factor over the integers you would type:
2
COLLECT(X –4)
which gives in real mode:
( ) ⋅ ( )
x + 2 x 2 –
Example
2
x – 2
To factor over the integers you would type:
2
COLLECT(X –2)
which gives:
2
x – 2
Define a function
For its argument, DEF takes an equality between:
1. the name of a function (with parentheses containing
the variable), and
2. an expression defining the function.
DEF defines this function and returns the equality.
2
2
. Suppose
2
). You could:
Computer Algebra System (CAS)