Texas Instruments TI-82 STATS User Manual

2.12 Math, Angle, and Test Operations
82STAT~4.DOC TI-83 international English Bob Fedorisko Revised: 10/28/05 12:19 PM Printed: 10/28/05 12:20
PM Page 12 of 26
82STAT~4.DOC TI-83 international English Bob Fedorisko Revised: 10/28/05 12:19 PM Printed: 10/28/05 12:20
PM Page 12 of 26
To edit or replace an equation stored to eqn when the interactive
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
leftNrt=diff
disappear. Move the cursor to the variable for which you now
want to solve and press ƒ [
SOLVE].
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( is available only from CATALOG or from
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.
solve( is valid only for real
numbers.
solve(expression,variable,guess[,{lower,upper}])
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.
Using the Equation Solver (continued)
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

Texas Instruments TI-82 STATS Specifications

General

Type	Graphing Calculator
Display	LCD
Resolution	96 x 64 pixels
Characters	16 x 8
Processor	Zilog Z80
Programming	TI-BASIC
Memory	28 KB RAM
Power	4 AAA batteries
Connectivity	Link port