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Using the
TI-84 Plus CE Calculator
(www.mathguy.us)
Prepared by: Earl L. Whitney, FSA, MAAA
Version 1.0
August 3, 2024
August 3, 2024
©2024 Earl Whitney, Reno, NV
1 |
P a g e
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Summary of Contents for Texas Instruments TI-84 Plus CE
- Page 1 Using the TI-84 Plus CE Calculator (www.mathguy.us) Prepared by: Earl L. Whitney, FSA, MAAA Version 1.0 August 3, 2024 August 3, 2024 ©2024 Earl Whitney, Reno, NV P a g e...
- Page 2 The Most Used Keys Graphing and table crea on keys Access blue func on keys Access green le er keys Variable key: for use with any variable Arithme c keys Common func on keys Store in and recall from memory key Nega ve sign for entering a nega ve number August 3, 2024...
- Page 3 Se ng up the TI-84 Calculator Turn the calculator on o Press: Turn the calculator off: o Press: Set the mode for use: o Press: o Setup should look like the image to the right o Use the arrow keys to move around and set the mode the way you want.
- Page 4 Tips for Using the TI-84 Plus are your friends. They will get you out of most situa ons you don’t know how to get out of otherwise. To break or interrupt an extended calcula on or program in a loop, press and hold for several seconds un l the error message [Break] appears on the screen.
- Page 5 To use informa on previously entered, you may use the arrow keys to move up or down to the previous expression or value and press the enter key at any point in a calcula on. o See the screen sequence below, in which I calculate areas for a couple of circles, then mul ply the first of those by 7 to get the volume of a cylinder.
- Page 6 Some things that the TI-84 can’t do or does poorly: o Show ver cal asymptotes. o Show holes in graphs. o Show precise points on a graph at most x-values. o Show precise x- or y-values on a graph. ...
- Page 7 Special Keys and Func ons Math Key Provides access to addi onal math func ons, as shown in the illustra on to the right. Press Across the top are menus with various func ons. o Move the cursor right or le with the arrow keys. o When you see the func on that you wish to use, move the cursor up and down with the arrow keys and press: o There may be more func ons available than are shown on the screen.
- Page 8 6:fMin( expression, variable, low x-value, high x-value ) For the example below, the func on is = and the range of x-values over which we seek the minimum is [−5, 0]. o To obtain the x-coordinate of the local minimum: 6:fMin( , −5, 0) ×...
- Page 9 Entering Matrices To enter data in a matrix, first define its name: will bring up the matrix menu. Move to the right at the top to EDIT. Select the matrix you want to define using the up and down arrow keys. Press .
- Page 10 Complex Numbers Complex numbers have the form + . That’s exactly how they are entered in the TI-84, except it’s a good idea to put parentheses around them. o Example: to calculate ( 2 + 3 ) , press (2+3 o The key is over the period.
- Page 11 Graphing a Func on – Tutorial Keys: To enter the func on you want to graph. To change the x- and y- limits on the screen, and to set the resolu on of the func on being graphed. To zoom in or out on a por on of the graph. To move the cursor along the graph to an interes ng point.
- Page 12 o You may no ce that something interes ng is happening to the graph when = 0. To see what is happening be er, change the se ngs for x and y to be the following, and press o Well, that’s not much be er. Something is clearly going on at = 0, and we have reached a limit to what the calculator can do.
- Page 13 Type the number 2 and press The calculator will show the value of y at the bo om of the screen, the func on used at the top of the screen, and a point on the graph, as shown below. ...
- Page 14 This func on is = . It’s a weird func on, but those are the ones that teach the most about graphing. Adjust your window se ngs for x- and y- as follows and re-graph. Your se ngs and graph should look something like this: ...
- Page 15 Press 3:minimum. Again, a point cursor, x- and y- values, and the func on defini on will appear on the graph. Hold down the le arrow key to move the cursor so that it is clearly to the le of the minimum point. Press ...
- Page 16 If you want the center to be somewhere else, move the cursor to that loca on and then press In the illustra on below, I moved the cursor to be near the minimum point before zooming in, though this is of li le value in this situa on.
- Page 17 Some Problems to Try: −2 Problem 1: ( ) = ; ( −6 ) . −2 Solu on: ( −2 × ( −6 ) + 8 ) ÷ ( −6 ) − 2 If you want a frac on for an answer: 1:Frac ...
- Page 18 Problem 3: Given that = − − 9 + 9, find the zeros and give the mul plicity of each. Solu on: We can do this by factoring, but let’s prac ce our graphing. First, clear all of the func ons in the screen by using the up and down arrows and the bu on.
- Page 19 −4 Problem 5: Solve the ra onal equa on: ( ) = < 0 +5 Solu on: We can do this problem purely algebraically, but it’s instruc ve to look at its graph. First, clear all of the func ons in the screen by using the up and down arrows and the bu on.
