Question about Texas Instruments TI-84 Plus Calculator

# I just got a TI84 plus, I am trying to figure out how to imput the following problem. 2/5x+6/5=-4/5 When I enter this in the calculator it gives me -3.9999 but the answer is -5 what am I doing wrong?

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• Anonymous Jan 21, 2009

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It is reading it as 5x. Use brackets like (2/5)*x+(6/5)=(-4/5)

Posted on Aug 26, 2009

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### Why is my ti84 giving me wrong answers when I use trig functions?

Your right you should be in degree mode. However, my guess is you are somehow entering in cot wrong in your calc. Recall cot = 1/tan! In your graphing calculator enter: 35(1/tan(61) = 19.4.
Hope this helped!

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### My Ti-84 plus silver is giving me wrong answer when I use normalcdf. I used video guide to make sure my entries were correct. lower:280 upper: 1E99 mu:272 sigma:9 I get answer .81296 the video and correct...

That is what I get with your numbers on the TI84 Plus Silver Edition 0.1870313608. I get the same on the TI83 Plus. What can I say?. Apart from an error entering the numbers ( a 6 for a 9, a 3 for an 8) I cannot think of anything else. Sorry.

Oct 26, 2013 | Texas Instruments TI-84 Plus Silver...

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You cannot get the calculator to behave as you describe just by connecting it to the computer. You must have done some other manipulations.
Try to find a classmate who has the same calculator (TI84 Plus or TI84 Plus Silver Edition) and effect a transfer of the OS from the classmate's calculator using an IO cable.

Sep 27, 2013 | Texas Instruments TI-84 Plus Calculator

1 Answer

### Installing

Try to find a classmate who has the same calculator (TI84 Plus or TI84 Plus Silver Edition) and effect a transfer of the OS from the classmate's calculator using an IO cable.
Alternatively, download the new version of TI Connect (version 4.) and install it on your computer. Then connect your calculator to the computer through the USB cable. When it recognizes the calculator click the update button in TI Connect interface and select update OS. Good luck.

Sep 27, 2013 | Texas Instruments TI-84 Plus Calculator

1 Answer

### My TI84 plus silver edition calculator is giving me an incorrect sign whenever I do an exponential function. When I type in -25^2, it gives me -625 instead of 625. How do I fix this?

It's giving you the correct answer. It's calculating the negative of 25 squared. 25 squared is 625, and the negative of that is -625.

If you want to calculate the square of negative 25, you need to tell the calculator that.

Press ( (-) 2 5 ) ^ 2 ENTER .

Sep 05, 2011 | Texas Instruments Office Equipment &...

1 Answer

### My TI-84 calculator lost its cover for the batteries. Since then it sometimes can't turn on or show anything when I push the button "on". But sometimes it still can work. But because I havent...

Hi twylazhangzh,

Sound like your Ti 84 Plus is really over loaded and, can't function properly. You can fix that by installing the newest Ti 84 Plus 2.55v. MP OS. operating system.

If you have a friend that has a Ti 84 Plus or, Ti 84 Plus Silver Edition you can connect the two calculators together through the IO link ports and, they can send you a copy of their OS while you receive it on your Ti 84 Plus. Hopefully your friend will have Ti84 Plus 2.55v. MP OS on their calculator or, it might not work.

If you can't find a calculator to connect to you can connect your Ti 84 Plus to a computer that has Ti Connect software on it. If you need to connect your Ti 84 Plus to a computer just keep following my instructions below.

First, you need to download and, install Ti Connect to your computer. If you don't need any help installing Ti Connect goto Procedure 1.

If your computer's OS is XP or Mac and, you need instructions to download and, install Ti Connect click, "Install Ti Connect on my XP or Mac OS". Just follow Procedure 1 at that posting and, come back to this posting to finish downloading and, installing Ti84 Plus 2.55v. MP OS to your calculator.

If your computer's OS is Windows 7 and, you need instructions to download and, install Ti Connect click, "Install Ti Connect on my Windows 7 OS". Just follow Procedure 3 at that posting and, come back to this posting to finish downloading and, installing Ti84 Plus 2.55v. MP OS to your calculator.

Procedure 1 to installing Ti84 Plus 2.55v. MP OS

1). You can also get the latest copy of Ti84 Plus 2.55v. MP OS and, guidebook by going to the Texas Instruments web site. You can get to that site instantly by clicking, "Ti 84 Plus 2.55v. MP OS!" Once your at the Ti site click the Download Item, "Ti84 Plus family operating system". Next you can login or, click "continue as guest". I'd would click the "continue as guest". Once you have click, "continue as guest" the Ti84 Plus family operating system will download to you.

Next, click "SAVE" and then a window to a folder will pop up. It is probably a window to a folder that you download too. If so, you may want to change it and, save to this folder, "My Documents \ My TI Data \ Downloads". You can also go back and, download the Ti 84 Plus guidebook too, if needed.

Link your computer and, Ti 84 Plus calculator with the USB cable or, Direct Black Link cable that came with the Ti 84 Plus calculator. Next, drag the Ti 84 Plus 2.55v MP OS that you saved earlier in "My Documents \ My TI Data \ Downloads" out of that folder and, drop it in the "Ti Connect" icon on the desktop. Click, "Continue" when the "Erase Warning" pops up and, the new Ti 84 Plus 2.55v MP OS will begin to install.

Next, the Ti Device window should pop up and, highlight the port when found that your Ti 84 Plus is using, USB1 cable or, Direct Black COM1.

When the Ti Device Explorer finds and, highlights your calculator's information click, "Select." Then click, "Yes" when the next window shows up with your calculator's information and, the OS will continue to download. Upon completion the newest Ti 84 Plus 2.55v. MP OS will be installed.

If you run into any trouble with software or, drivers just comment to what failed at this posting and, I'll be glad to help you.

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1 Answer

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It sounds like you're in scientific or engineering notation.

Press MODE, use the arrow keys to highlight "NORMAL" on the first line, press ENTER and then 2ND [QUIT].

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1 Answer

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Hello,
The Texas Instruments FAQ area of their web site has on such question answered. You may want to read the relevant article. Scroll down the page and look for the part on the TI83/TI84 Plus family.
Hope you will find the answer to your calculator's woes.

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Ti 83 and ti84 really have no difference and operate the same. There was something different or you had varibles used by multiple programs that conflicted w/ the ti84 and it would have done the same on the ti83. If you like to rework it and need help email me at raklein62@yahoo.com

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