Texas Instruments TI-82 STATS Manual Book page 62

Using the Equation Solver
Editing an
Equation Stored
to eqn
Equations with
Multiple Roots
Further Solutions
Controlling the
Solution for
Solver or solve(
Using solve( on
the Home Screen
or from a
Program
2.12 Math, Angle, and Test Operations
To edit or replace an equation stored to
equation solver is displayed, press } until the equation editor is
displayed. Then edit the equation.
Some equations have more than one solution. You can enter a
new initial guess (page 2.10) or new bounds (page 2.11) to look
for additional solutions.
After you solve for a variable, you can continue to explore
solutions from the interactive solver editor. Edit the values of
one or more variables. When you edit any variable value, the
solid squares next to the previous solution and
disappear. Move the cursor to the variable for which you now
want to solve and press ƒ [
The TI-82 STATS solves equations through an iterative process.
To control that process, enter bounds that are relatively close to
the solution and enter an initial guess within those bounds. This
will help to find a solution more quickly. Also, it will define
which solution you want for equations with multiple solutions.
The function
solve(
within a program. It returns a solution (root) of expression for
variable, given an initial guess, and lower and upper bounds
within which the solution is sought. The default for lower is
L1â99. The default for upper is 1â99.
numbers.
expression variable
solve( ,
expression is assumed equal to zero. The value of variable will
not be updated in memory. guess may be a value or a list of two
values. Values must be stored for every variable in expression,
except variable, before expression is evaluated. lower and upper
must be entered in list format.
(continued)
eqn
].
SOLVE
is available only from
solve(
guess[ lower
, ,{ ,
when the interactive
diff
leftNrt=
or from
CATALOG
is valid only for real
upper ]
} )