TI-83, TI-83 Plus, TI-84 Plus Guide
Press
2ND GRAPH (TABLE), and observe the list of input
and output values. Notice that you can scroll through the table
with
▼ , ▲ , ◄ , and/or ► . The table values may be
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
ASK feature of the table instead of using AUTO.
Note that when using
ASK, the settings for TblStart and ∆Tbl do not matter.
Return to the table set-up with
2ND
WINDOW
(TBLSET), and choose ASK
in the
Indpnt: location. Press ENTER .
Press 2ND GRAPH (TABLE) to go to
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. (Solving using graphical methods will be discussed after using the
SOLVER is explored.) You can refer to an equation that you have already entered in the Y=
list or you can enter the equation in the solver.
Return to the home screen with 2ND MODE (QUIT). Access
the solver by pressing
MATH 0. If there are no equations
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 to delete the old equation. You should then
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
t
)
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
t
) = 20. We must enter the equation into the solver with a 0 on the left side,
so subtract 20 from each side of 3.5(1.095
t
) = 20 and exchange the sides to obtain the equation
0 = 3.5(1.095
t
) – 20 = 0.
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