Finding Input Values Using The Solver - Texas Instruments TI-84 Plus Manual

TI-83, TI-83 Plus, TI-84 Plus Guide
Press
2ND
and output values. Notice that you can scroll through the table
with
▼ , ▲
rounded in the table display. You can see more of the output by
highlighting a particular value and viewing the bottom of the
screen.
If you are interested in evaluating a function at inputs that are not evenly spaced and/or you
only need a few outputs, you should use the
Note that when using
Return to the table set-up with
WINDOW (TBLSET),
in the
Indpnt:
Press
2ND
the table and enter the x-values.
FINDING INPUT VALUES USING THE SOLVER Your calculator solves for the input
values of any equation that is in the form "expression = 0". This means that all terms must be
on one side of the equation and 0 must be on the other side before you enter the equation into
the calculator. The expression can, but does not have to, use x as the input variable.
The calculator offers several methods of solving for input variables. We first illustrate
using the
SOLVER
is explored.) You can refer to an equation that you have already entered in the
SOLVER
list or you can enter the equation in the solver.
Return to the home screen with
the solver by pressing
stored in the solver, you will see the screen displayed on the
right − or
− if the solver has been previously used, you will see a screen
similar to the one shown on the right. If this is the case, press
and
▲ CLEAR
have the screen shown in the previous step.
Let's now use the solver to answer the question in part c of Example 3 in Section 1.1: "When
did the land value reach $20,000?" Because the land value is given by v(t) = 3.5(1.095
thousand dollars where t is the number of years after the end of 1985, we are asked to solve the
equation 3.5(1.095
so subtract 20 from each side of 3.5(1.095
t
0 = 3.5(1.095 ) – 20 = 0.
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, and observe the list of input
GRAPH (TABLE)
, , and/or The table values may be
◄ ► .
, the settings for
ASK
2ND
and choose
ASK
location. Press
ENTER .
to go to
GRAPH (TABLE)
. (Solving using graphical methods will be discussed after using the
2ND
. If there are no equations
MATH 0
to delete the old equation. You should then
t
) = 20. We must enter the equation into the solver with a 0 on the left side,
feature of the table instead of using
ASK
and ∆Tbl do not matter.
TblStart
Access
MODE (QUIT).
t
) = 20 and exchange the sides to obtain the equation
.
AUTO
Y=
t
)
9