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# Difference between Ti-84 and Ti-89

Registered User Posts: 1,130 Senior Member
edited November 2008
Hello, my friend recently told me that for the SAT II Math 2, one should just buy the TI-89 because allegedly, it can perform many fucntions that the TI-84 cannot.

As such, I'm wondering if anybody has any information/tricks regarding this.

I have used google but cannot find any SAT II Math specific tricks or advantages that the TI-89 has over the TI-84..

Anybody who could shed a bit of light on this question would be highly appreciated.
Post edited by lolilaughed on
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## Replies to: Difference between Ti-84 and Ti-89

• Registered User Posts: 527 Member
I found that I didn't need a calculator at all for the most part. TI-89 is definitely not necessary. if it makes you feel better though, I'm sure you could save a few seconds with some of its built-in functions.
• Registered User Posts: 1,130 Senior Member
Haha, what are some of the built-in functions.

As far as I know.... we only need calc for:

Matrices/Determinants, Standard Deviation, Extrapolation?

Anything else?
• Registered User Posts: 1,295 Senior Member
Seems to me my D had to borrow a TI-84 from her brother (to whom she passed her 84 when she bought the 89 because it was required for a calc class) to use on either the SATI or the SATII Math 2 because using the TI-89 wasn't allowed...AND...she lamented having bought the 89 at all because she found it comparitively difficult to use and felt the 84 would have sufficed.
• Registered User Posts: 1,130 Senior Member
^ Oh, but in order for it to be outlawed, it would need to be able to function for a lot more things than TI-84.

For curiosity's sake, what would those functions be? Maybe, I can learn what's too powerful for the TI-89 and write something up for TI-84
• Registered User Posts: 117 Junior Member
lol it can solve derivatives, integrals, implicit differentiation, you name it. It's \$20 more. In a college level Engineering course you will NEED it.
• Registered User Posts: 1,130 Senior Member
The Ti-84 can also solve derivatives/integrals etc..

none of which we need for the Math 2

Any other ideas?
• Registered User Posts: 115 Junior Member
TI-89 can solve derivatives, integrals, limits, etc symbolically. You can type in the expression with variables and it will give you the answer.

For Math II, the equation solver and expression expanding/factoring capabilites might be helpful.
• Registered User Posts: 1,130 Senior Member
^ The TI-84 also has an equation solver... not sure about factoring capabilities.

But I see what you mean about the TI-89. But for the MATH 2, there isn't that much calc stuff is there?
• Super Moderator Posts: 2,529 Super Moderator
I always use TI-89 on Math 2.
3-4 questions are often solved ("solve" function, doh) faster on that machine.
I am not saying using TI-84 will prevent you from getting 800.

^lolilaughed - there is no calc on Math 2 you'd need TI-89 for.
In October there was question on maximum, but it was peanuts to answer with sheer graphing and tracing.
I wish TI-89 was a literary device and allowed on Literature. :D
• Registered User Posts: 527 Member
just to put it into perspective, I just used a scientific calculator and got 800... in fact, I'm pretty sure they designed it so you don't HAVE to have a calculator to get every question correct.
• Registered User Posts: 146 Junior Member
as a person who used both, lemme tell you i hated the 89. it was like using a sword when a needle was required.
teh 84 is more than enough. the calculus and all in math 2 is so basic that even a 84 is not required. but 84 is perfect for all ur needs. the right blend of smart, speed and simplicity. plus cheaper too.
• Registered User Posts: 134 Junior Member
The 89 is much better if you know how to use it. It can solve systems (technically, you can do this with matrices on an 84, but who would want to do that? it would take like twice as long...), help you with max/min problems, find limits, sigmas (this can be done with sum(seq(blahblah)) on 84 but is much more powerful and intuitive on an 89). An 89 has a computer algebra system. This means that if you plug in something like (x+y)^3 (that's (x+y) cubed) you can ask for it to be expanded to x^3 + 3 x^2 y + 3 x y^2 + y^3. All around, it has more functions and is just an upgraded, more powerful calculator. The only argument you could make for it being worse is if you haven't used it and you are saying that it is "too complicated." It's really not bad once you get used to it.

just to add, i used an 89 and got an 800, and while i would've got an 800 with an 84, it would have taken a lot more effort.
• Registered User Posts: 1,313 Senior Member
YEah... I agree. The TI 89 is crazy awesome. The factor/solve/expand functions are incredible, especially for the IIC test. I believe it also graphs faster than the 84?
• Registered User Posts: 3,256 Senior Member
If ti-84 is good, ti-89 is god.

Disclaimer: Only when you know how to use the 89 will you unlock its true power!
• - Posts: 16,060 Senior Member
A lot of TI 84 functions are so slow they're useless. If you know what you're doing, you can have it graph the integral of a function. That takes about 10 minutes, and you can't stop it.
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This discussion has been closed.