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Texas Instruments TI-89 Titanium Graphing Calculator w/ Cover - Tested / working - Picture 1 of 12
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Texas Instruments TI-89 Titanium Graphing Calculator w/ Cover - Tested / working

My Goodness Square
(339)
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US $47.99
ApproximatelyAU $73.58
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Condition:
Used
More information - About this item condition
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US $16.65 (approx. AU $25.53) USPS Ground Advantage®.
Located in: Staten Island, New York, United States
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Estimated between Thu, 14 Aug and Tue, 19 Aug to 94104
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eBay item number:406026261506
Last updated on 08 Aug, 2025 09:23:41 AESTView all revisionsView all revisions

Item specifics

Condition
Used
Brand
Texas Instruments
Key Size
Regular
Type
Graphing
Display Size
Regular
Power Source
Battery
Size
Handheld
Model
Texas Instruments TI-89
Features
Calculus, Programmable, USB
MPN
TI-89 TITANIUM
UPC
N/A

Item description from the seller

About this seller

My Goodness Square

100% positive Feedback•721 items sold

Joined Jul 2022
Usually responds within 24 hours
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Detailed seller ratings

Average for the last 12 months
Accurate description
4.8
Reasonable postage costs
4.7
Postage speed
5.0
Communication
5.0

Seller feedback (334)

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  • s***k (44)- Feedback left by buyer.
    Past month
    Verified purchase
    The item arrived as described, it was well packaged/wrapped in the box, and it was shipped quickly. The value was good. Great experience! Thanks!
    Lego 40782 Tropical Rainforest Diorama New Sealed (#405752884378)
  • n***o (304)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    I was just lucky to find a card case in this Kate Spade color called Plum pie as it perfectly matched my purse which is also a dark pinkish purple. It was much appreciated that this seller had photo images that reflected the true colors of the actual item that a customer could rely on as it was delivered looking just like the photos and in great condition as promised and of course in the usual Kate Spade quality. Fast shipping from this seller. Thanks !!!!
    Kate Spade Card Holder New York Staci Saffiano Small Slim Plum Pie Leather New (#405287937229)
  • l***K- Feedback left by buyer.
    Past 6 months
    Verified purchase
    Perfect, love them! Shipped fast and protected well. Seller included a prepaid return envelope, too, but they are great and I am keeping them. Many thanks! I wish all eBay sellers were like you!
    Gloria Vanderbilt Amanda Jeans Womens Size 12P Slimming Classic Rise Tapered Leg (#405084546783)
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Product ratings and reviews

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4.7
416 product ratings
  • 356 users rated this 5 out of 5 stars
  • 37 users rated this 4 out of 5 stars
  • 6 users rated this 3 out of 5 stars
  • 2 users rated this 2 out of 5 stars
  • 15 users rated this 1 out of 5 stars

Good value

Would recommend

Good quality

Most relevant reviews

See all 242 reviews
  • by warburrito
    13 May, 2020Top favourable review

    Works great for my high school son

    Works great for my son who is in high school. Apparently whatever model the teacher uses has a few keys that are in different spots so not every function works using the exact same keys, but that has not been a problem for my son. However, if your child's teacher uses a specific model I would suggest getting that model instead so that learning would be easier for someone not as technologically inclined as my son.

    Verified purchase: YesCondition: Pre-owned

  • by dadgum1
    14 Feb, 2017

    Powerful calculator

    This is a used item of course, so the only thing guaranteed is the calc itself. I'm loving the computer algebra system on it; taking DE and Linear Algebra this semester and never knew how much of a time saver it was. Solves for x, does operations for polynomials, factors, integrates and d/dx functions, trig extpansion, etc. Only thing thats kinda a pain is matrices, but you get used to it. Wish I had this earlier. Lot of other calcs have CAS, but this is at great price too. this website lists a lot of the features and gives you a good idea of what this calc can do and gets you started using fast as well: prenhall d0t c0m /esm/app/graphing/ti89/homescreen/Menukeys/f1 d0t html replace all the d0ts and c0m

    Verified purchase: YesCondition: Pre-ownedSold by: Vt793et9Q3O@Deleted

  • by msrobin2
    08 Sep, 2016

    Perfect for the engineering student

    If your studying engineering this is a must have, It has all the features that you need to succeed. with it's build in computer algebra system it can evaluate and simplify expressions, and display them as they would be written by hand thus making test easier. It returns all of the equations for a quadratic variable making it the ideal cheat-a-lator. well worth your time and effort to learn how to use this jewel.

    Verified purchase: YesCondition: Pre-ownedSold by: 222775

  • by sterlinghhartman
    21 Aug, 2019

    PhD Mathematician in Plastic

    Incredibly powerful \. You probably won't be able to use all of its functions. On the negative side: font showing date and time is incredibly small and there is no way to increase font size.

    Verified purchase: YesCondition: NewSold by: dealoff

  • by pokemon1216029
    01 Mar, 2018

    Really great calculator.

    The beauty of this calculator is that it can perform basic algebraic functions for you; no more binomial expansion or tedious polynomial operations. Makes checking work very easy, and is even approved for the SAT and AP examinations. And the price is right; used with barely any wear.

    Verified purchase: YesCondition: Pre-ownedSold by: nhfastcash

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