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
leftNrt=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 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.
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