Symbolic Functions - HP 39g+ User Manual

Symbolic functions

equals
= ( )
ISOLATE
LINEAR?
QUAD
Using mathematical 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
( ) as well as the MATH menu.
CHARS
Sets an equality for an equation. This is not a logical
operator and does not store values. (See "Test functions"
on page 11-18.)
expression1=expression2
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)
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
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
2
QUAD((X-1)
(2+s1*5.29150262213)/2
-7,X) returns
11-17