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Using mathematical functions 10-19

Symbolic functions

The symbolic functions are used for symbolic manipulations

of expressions. The variables can be formal or numeric, but

the result is usually in symbolic form (not a number). You will

find the symbols for the symbolic functions = and | (where) in

the CHARS menu (>6+,)7@

CHARS) as well as the MATH menu.

= (

equals

) Sets an equality for an equation. This is not a logical operator

and does not store values. (See “Test functions” on page 10-

20.)

expression1=expression2

ISOLATE Isolates the first occurrence of variable in expression=0 and

returns a new expression, where variable=newexpression.

The result is a general solution that represents multiple

solutions by including the (formal) variables s1 to represent

any sign and n1 to represent any integer.

ISOLATE(expression,variable)

Examples

ISOLATE(2*X+8,X) returns -4

ISOLATE(A+B*X/C,X) returns -(A*C/B)

LINEAR? Tests whether expression is linear for the specified variable.

Returns 0 (false) or 1 (true).

LINEAR?(expression,variable)

Example

LINEAR?((X^2-1)/(X+1),X) returns 0

QUAD Solves quadratic expression=0 for variable and returns a new

expression, where variable=newexpression. The result is a

general solution that represents both positive and negative

solutions by including the formal variable S1 to represent any

sign: + or – .

QUAD(expression,variable)

Example

QUAD((X-1)

-7,X) returns

(2+s1*5.29150262213)/2

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HP 39g Graphing Calculator Betriebsanweisung Seite 155