<p>Ti-89 is really useful if you know what is going on in your calculus classes but don't want to do the homework, because it solves problems easily but obviously shows no work.</p>
<p>However, despite its many features, it is a little slower than 83 and 84 because you always feel a slight lag time after you press the enter button that doesn't happen with the older models.</p>
<p>yes get the Ti-89 I took cal ab last year and it worked really well for me, and was very helpful!!</p>
<p>Although my friend has a 83+ and the calculator worked fine with him to!!</p>
<p>YES! I LOVE MY TI89. It takes a week or so to get use to it, so keep the manual close. But after that....Wow....</p>
<p>Yes. Get in your car, drive to the store, get out, and buy the TI-89. I love mine. It has a steep learning curve, but the journey to mastery only lasts several weeks (sleeping with the 89 will speed up this process). It is so much more efficient than the 83 on higher level math (Calc +). I wouldn't recommend it for anything less, though.</p>
<p>Try solving derivatives and finding the area under a curve with both (83/84 and 89) and see which one you like.</p>
<p>I will be taking calc bc next year and right now i only have a ti-86. Do i need to get an 89 or will the 86 be good enuf? Has anyone here taken bc with an 86?</p>
<p>idk about TI-89 b/c i think alot of college math classes dont allow them b/c of how advanced they are.</p>
<p>TI-89 is difficult to use and it's only really useful functions for high school math IMO are its ability to expand and factor polynomials. Not worth the money.</p>
<p>^ My Ti-89 with USB cable, manual, CD, and peer-to-peer, was cheaper than my Ti-83. Use eBay. ;)</p>
<p>In that case you might consider getting one. Still, for the simplest tasks it's a little tedious to use.</p>
<p>Um not really...after you get used to it..it's easier to use then the ti83 :P</p>
<p>TI-89</p>
<p>^^^What you know about that?</p>
<p>^... Hey, I know all about math! Don't you know I represent math league, when I add...</p>
<p>I actually don't like my TI-89. But I think that has more to do with my general dislike of calculators, and has nothing to do with the TI-89.</p>