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

For example, suppose you have stored the expression x2 in G, and have defined the function F(x) as x2. Suppose now you want to calculate INTVX(X2). You could:

•enter INTVX(X2) 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.

ALGB menu

COLLECT

Factors over the integers

 

COLLECT combines like terms and factors the expression

 

over the integers.

 

Example

 

To factor x2 – 4 over the integers you would type:

 

COLLECT(X2–4)

 

which gives in real mode:

 

(x + 2) ⋅ (x – 2)

 

Example

 

To factor x2 – 2 over the integers you would type:

 

COLLECT(X2–2)

 

which gives:

 

x2 – 2

DEF

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.

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Computer Algebra System (CAS)