Expanded Capabilities of the Newer TI-84 Calculators

Expanded Capabilities of the Newer TI-84 Calculators

Content:  This page gives explains the added capabilities of the TI-84 Silver Edition and those with OS 2.55 or higher.

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Purpose:

This page augments the Brief User's Guide, found on this website, for the TI-83Plus/TI-84.  It explains the new capabilities
of working with fractions,  matrices, some calculus functions, a few additions to the MATH menu, and the Stats Wizard.

General:
The TI-84 Silver Edition and those older TI-84 calculators that have been upgraded to OS 2.55 have several capabilities
that the TI-83 Plus and the older TI-84 calculators do not have.  If you use your calculator frequently, and you have one
of the older TI-84 calculators, you may find it worthwhile to download and install the newer OS. The installation can be done
with the TI Connect software, which is available from the TI Website, and the USB cable that came with your calculator.

New Additions: The new features offer some new methods of working with fractions and a STAT WIZARD that makes it
unnecessary to remember the syntax for the functions under the menus DISTR, DRAW,  and STAT> CALC.  There are
additional functions associated with the F-1 through F4 keys.  Some of these functions are also under the MATH menu.

Using the Stat Wizard:
a) Press MODE and scroll down to STAT WIZARD and press ENTER to activate the Stat Wizard.
b) Suppose you want to use normalcdf(.  Pess 2ND, DISTR and a screen such as the following Figure 1 will appear.

Figure 1. Stat Wizard with data entered.

The figure already has data entered.  You will need to enter your own.  Enter your own data; then move the cursor to
highlight Paste and press ENTER.  The expression Normalpdf(-1E9,30, 25, 4.5) will be pasted to the home screen with
the data in the figure.  Press ENTER and the answer will be given. The other functions are done similarly.

Activating the Fraction Functions:  Press MODE and highlight MATHPRINT and press ENTER.  Now, select your preferred
format for displaying numbers greater than 1. The entry u/d (number 1) will set up a format for entering a proper or improper fraction;
Un/d operates similarly for a mixed number (number plus fraction).
You will probably use this for multiplying numbers other than whole numbers.  Incidentally, all four of the functions displayed in
Figure 1 below, are also in the MATH>NUM menu.

Examples of Operations:
Of course, you can also use these operations in tandem.
1.  Suppose you want to convert 3.125 to a mixed number.
a) First enter 3.125; then press ALPHA, F1.  The screen in Figure 2 will appear.

Figure 2.  Fractions screen.

You can break the operation into two separate parts or do it all in one.  I'll do it in one

b)  Press 4, ALPHA, :, 2nd, Ans, F1, 3. Then press ENTER and the equivalent improper fraction 25/8 will appear
in MATHPRINT.
2. Now suppose we want to multiply 1/3 *1/4 in MATHPRINT
a) Press F1, 1 and blank spaces for entering the numbers will appear.
b) Press 1, press right arrow, press 3, right arrow to enter 1/3.
c) Press x (the multiply sign), ALPHA, 1.
d) Press 1, left arrow, 4, left arrow, ENTER. The answer, 1/12 will appear in MATHPRINT.
3.  You can also convert between fractions and decimals and the reverse using item 4 on that
same menu. Just enter the decimal such as 0.0625, press F1, 4, ENTER and 1/16 will be displayed.

There are several useful functions obtained by pressing ALPHA, F2.  Perhaps the most useful to me are
the derivative at a point, value of the definite integral over a selectable range, and the logarithms to any
base.  Doing log base 2 of 1024 is done as follows:
a)  Press ALPHA, F2 and select 5. The log format will be set up for number entry.
b)  Press 2, right arrow, 1024, right arrow; then press ENTER to get the value 10.
Doing Matrices with ALPHA, F3:

Doing matrices using the TI-83 Plus can be a bit tedious because of the movement back
and forth between menus.  The F3 key makes that somewhat faster.  Suppose we want to
solve the system of linear equations:
2x-3y=12
-2x+y=-4
a) Press 2ND, MATRIX, move the cursor to MATH, and press ALPHA, B to display rref(.
b)  Press ALPHA, F3 and the Select 2 rows and 3 columns then highlight OK and press ENTER.
c) In the zero matrix that is displayed, overwrite the zeros with  2, -3, 12, -2, 1, -4 being sure to press the right arrow after
each entry rather than the ENTER key.  After the last entry press the right arrow once more.
d) Press ENTER and the answer will be displayed.
NOTE: You can always go back using the left arrow until ENTER is pressed.  If you find you made
and error after pressing ENTER, just press 2ND, ENTER to display the whole entry and edit your
error.
Using ALPHA F4:
F4 is useful for printing the Y-variables on the home screen, and perhaps more useful for printing
them in the Y= screen.  Suppose that you want to graph y =±  √(x-3).
a) Enter the positive expression in Y1. Be sure to press the right arrow after you're finished.
b) Move the cursor to Y2, press - (the negative sign), ALPHA, F4, highlight Y1 and press ENTER.
c) Press GRAPH and both the + and - expressions will be graphed.

Released: 9/10/12    Revised: 4/17/13