Operation Manual

2-12 Math, Angle, and Test Operations
8302MATH.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:12 PM Printed: 02/19/01 2:27
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
left
N
rt=
diff
disappear. Move the cursor to the variable for
which you now want to solve and press
ƒ
[
SOLVE
].
The TI
-
83 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
L
1
â
99. The default for
upper
is 1
â
99.
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.
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