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lowerBound<upperBound
must be true.
You can enter a list variable
at the
prompt if a
bound=
valid two-element list is
stored to it.
If you exit the equation
solver, any equation stored to
eqn is displayed when you
return to the equation solver.
The TI-86 solves equations through an iterative process. To control that process, you can
enter lower bounds and upper bounds that are close to the solution, and enter a guess
within those bounds in the prompt for the unknown variable.
Controlling the process with specific bounds and a guess helps the TI-86 in two ways.
It finds a solution more quickly.
It is more likely to find the solution you want when an equation has multiple solutions.
To set more precise bounds at the
lowerBound
upperBound
bound={
,
At the prompt for the unknown variable, you may enter a guess or a list of two guesses. If
you do not enter a guess, the TI-86 uses (lowerBound+upperBound)à2 as a guess.
On the solver graph (page 207), you can guess a solution by moving the free-moving cursor
or trace cursor to a point on the graph between lowerBound and upperBound. To solve for
the unknown variable using the new guess, select
solution is displayed on the interactive-solver editor.
Editing the Equation
To edit the equation stored to
until the cursor is on the equation. The equation-entry editor is displayed. The TI-86
automatically stores the edited equation to
If you store an equation to
and then edit the equation stored to
changed. Likewise, subsequently editing the contents of the equation variable (
example) does not change
prompt, the syntax is:
bound=
}
SOLVE
when the interactive-solver editor is displayed, press $
eqn
as you edit.
eqn
by recalling the contents of an equation variable, such as
eqn
, the original equation (in
eqn
.
eqn
Chapter 15: Equation Solving
from the solver graph menu. The
, for example) is not
y1
y1
205
,
y1
, for
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