HP 39gII User Manual page 311

EXTREMUM
ISECT
ROOT
SLOPE
Solve app
functions
SOLVE
Programming
AREA(Fn, [Fm,] lower, upper)
Example:
2
-2, -2, 1) returns 4.5
AREA(-X, X
Extremum of a function. Finds the extremum (if one exists)
of the function Fn that is closest to the X-value guess.
EXTREMUM(Fn, guess)
Example:
2
-X-2, 0) returns 0.5
EXTREMUM(X
Intersection of two functions. Finds the intersection (if one
exists) of the two functions Fn and Fm that is closest to the
X-value guess.
ISECT(Fn, Fm, guess)
Example:
ISECT(X, 3-X,2) returns 1.5
Root of a function. Finds the root of the function Fn (if one
exists) that is closest to the X-value guess.
ROOT(Fn, guess)
Example:
2
, 2) returns 1.732...
ROOT(3-X
Slope of a function. Returns the slope of the function Fn
at the X-value (if value exists).
SLOPE(Fn, value)
Example:
2
, 2) returns -4
SLOPE(3-X
The Solve app has a single function that solves a given
equation or expression for one of its variables. En may be
an equation or expression, or it may be the name of one
of the Solve Symbolic variables E0-E9.
Solve. Solves an equation for one of its variables. Solves
the equation En for the variable var, using the value of
guess as the initial value for the value of the variable var.
If En is an expression, then the value of the variable var
that makes the expression equal to zero is returned.
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