How to Get the Brightness Back on a TI-84 Plus
The TI-84 Plus graphing calculator displays its output on a small black and white screen. Under certain lighting conditions, you may find that the screen is too bright and needs to be dimmed for improved visibility. If you ever want to increase the brightness for a more vibrant image, you can do so using several buttons on the front of the calculator.
Press "ON" to turn on the TI-84 Plus calculator.
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Press the button labeled "2ND."
Press the up-arrow button on the front of the calculator. This will increase the brightness on the screen. To further increase the brightness, press "2ND" and then press the up-arrow button again. Repeat to continue increasing the brightness incrementally until the desired level is achieved.
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Home | TI-83 Plus and TI-84 Plus family of products
Solution 34534: Solving a Quadratic Equation Using Numeric Solver on the TI-84 Plus CE and TI-84 Plus C Silver Edition.
How can i solve a quadratic equation using numeric solver on the ti-84 plus ce and ti-84 plus c silver edition.
Please see the TI-84 Plus CE and TI-84 Plus C Silver Edition guidebooks for additional information.
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Quadratic Formula for the TI-83 and 84
Introduction: Quadratic Formula for the TI-83 and 84
Have you ever wondered if there is a way to make your calculator solve quadratic equations for you? Well, there is a fairly easy way to make your calculator do all the work for you. Another program that I have put on Instructables is Heron's Formula. www.instructables.com/id/Herons-Formula-program-for-the-TI-83-and-84/
Step 1: Getting Started
You should know that a quadratic equation looks something like this: x^2-3x+2=0 or ax^2+bx+c=0. This will be important later on. The first step is to press the program button on your calculator. Press the right arrow twice to get to new and select create new. Enter a name. Now press program again and press the right arrow then press 2. To get letters, push the alhpa button. Now enter A,B,C and hit enter.
Step 2: The Equation
Look at the first picture and put that on your calculator. Make sure you use the negative button before the first b! The -> is the store button. Press sto-> to get that. This just makes the equation equal to x. You may have noticed that this is only plus the square root of b squared... There is no button on this calculator for plus or minus so you will have to enter it as two separate equations. Refer to the second picture for the second part of the equation. It is just like the first part except for a couple things.
Step 3: Displaying Results
Press program , then the right arrow , then 3 . This will make the calculator display the answers. First open quotes ( alpha , + ) then put in 12 spaces (space is alpha then 0 ) x= and close quotes. The equal sign is found by pressing 2nd and then math (test). Then enter ,x,y . (Hint: Press 2nd then alpha to make it easier to type letters.) You can look at the picture if you need help. Make sure that you have the exact same thing as the picture below.
Step 4: Using the Program
To exit out of this do not hit clear!!! This will delete everything on the line! Make sure you hit 2nd then mode (quit). Now push program and select the one you just made. Hit enter and type in the value of A. Then do this for B and C. Remember ax^2+bx+c=0. Example: x^2-3x+2=0; A= 1 , B= -3 (use negative sign if necessary), C= 2. The bold numbers are the numbers that you would enter in your program. After you enter all three variables hit enter and you get your answer.
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74 Comments
Question 2 years ago on Step 3
My calculator just shows 3 dots instead of the answer. WTF IS WRONG!!
Question 2 years ago
Hi, I was able to do it from another tutorial similar to yours! My answers display in decimal forms (ex. 5.13467...). How do I make it display the answers as a square root (ex. 5√3)?
4 years ago
Mine says Err:NONREAL ANS anyone got any idea of what I can do to fix is?
Reply 2 years ago
Change the mode from “Real” to either “a + bi” or “re^0i” by pressing the Mode button
Reply 4 years ago
The program on step 2 above has an error. The equation should have parentheses around the 2A. It's written correctly in step 3. Also, if your values of A, B, and C cause a negative under the square root, you will get a nonreal answer.
This means that the roots of the equation are complex, represented with i. You will learn more about complex numbers in algebra II. For now, the answer to the question "how many roots does this function have" should be no real solutions.
Question 3 years ago
How do you get the = sign on your calculator? I can't find the option anywhere.
Answer 2 years ago
“2nd” key + “MATH” key
Answer 3 years ago
click 2nd then math button under alpha
I've triple checked my programs and even added parentheses as suggested in comments but keep betting 2.618... & .3819.... as answers. Is there some other setting that is incorrect on this calculator that could be giving me incorrect computations?
I'm also getting incorrect answers. This doesnt always give the correct answer Its telling me that 4.9t^2-6.86t+1.05 ends up being 4.2, 29.4.
3 years ago
I owe you my life and children
Reply 3 years ago
and possibly your wife as well
Many thanks for the effort you put in this!!!
These instructions are so easy to follow and helpful! Thank you!
Thank you so much!!
5 years ago
I have a TI-84, followed the instructions, and added parenthesis' around the variables to ensure I got correct answers with more complicated numbers. Works great, thanks!
If god is really you would be him
Question 4 years ago on Introduction
I cannot find the = sign onmy TI 84+Silver. Thanks Steve
U are the best!!!
Quadratic Equations on TI-83/84
Copyright © 2004–2022 by Stan Brown, BrownMath.com
Summary: You can program your TI-83/84 to solve quadratic equations, and this page shows you the procedure. Though you need to know how to solve quadratics by the methods taught in class , the program is a great way to check your work for accuracy.
The Program
The program below solves a quadratic equation whether it has real roots or not.
If you have the TI Graph Link software, you can download the program from this ZIP file (13 KB, revised 22 June 2008), unzip it to any convenient directory, and download it to your TI-83/84.
Otherwise, you can enter the program manually. If you’re not familiar with TI-83/84 programming instructions, please see the keystroke procedure in Entering the Program , below.
Disp "AX²+BX+C=0" Prompt A,B,C B²-4AC→D Disp (-B+√(D))/(2A) Disp (-B−√(D))/(2A) DelVar A DelVar B DelVar C DelVar D
Running the Program
To run the program, press [ PRGM ]. Look at the list of programs and press the appropriate number; or scroll to the program and press [ ENTER ]. The program name will appear on your screen. Press [ ENTER ] to run it.
Example: 25 x ²−20 x = −4. First put it in standard form, 25 x ²−20 x +4 = 0. Now run the program with A=25, B=−20, C=4. You see roots of .4 and .4, a double root of 2/5. This makes sense because the equation factors as (5 x −2)² = 0.
Try additional examples using equations in your textbook. Remember that the calculator program is intended for checking your calculations; you’ll still be expected to solve quadratic equations manually in class and in homework.
Complex Roots
You can now run the program again to view the non-real roots. The calculator remembers a+bi mode, like all modes, even when turned off.
See also: Complex Numbers on TI-83/84
Entering the Program
Programming the TI-83/84 isn’t hard, but it does use a bunch of keys and menus you might not be familiar with. Just type everything exactly as shown , and check the display as you go along. Don’t press the [ 2nd ] or [ ALPHA ] key unless the instructions tell you to, and do be careful not to use one in place of the other.
I recommend ticking off each step with a pencil as you do it, so that you don’t get lost.
If you see any differences, cursor to the mistake and correct it. Remember you can use [ 2nd DEL makes INS ] to insert characters so that you don’t have to retype a whole line. After making your corrections, move the cursor back to the empty line at the bottom.
If you’ve done everything right, your program is now ready for testing !
What’s New?
- 1 Dec 2009 : Correct [ ALPHA APPS makes C ] to [ ALPHA PRGM makes C ] , thanks to Rebekah Pass.
- (intervening changes suppressed)
- 25 Jan 2004 : New article and TI-83 program.
Updates and new info: https://BrownMath.com/ti83/
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