TI-83 help...

[Ladogaboy]

My GF has to do a something math wise ( you know, that stuff)... anyway, she came up with the equation 2^X = 1.8

Is there a function on the TI-83 that allows you to find X?

[coleslaw]

The TI-83 should have an equation solver. It might be a 2nd function called SOLVER. You should be able to enter 2^x, then enter what the equation equals and then solve for x.

[Ladogaboy]

Oh, hmm... she said she found what she was looing for.. the X rad, or something, in the MATH subfolder... :shrug: I guess that works. :D

She'll let me know if it doesn't work! ;)

[coleslaw]

If you actually want to learn something rather than using a stinky calculator to do the work for you, here's what you can do to solve this equation.

First, you begin by taking the logarithm of both sides of the equation. This can be either log or ln, so choose your favorite:

log 2^x = log 1.8

Now, one rule of logs is that an exponent can be transplanted from within the log function to multiplication. So we have this:

x log 2 = log 1.8

Now, divide:

x = (log 1.8)/(log 2)

Punching this into your calculator reveals that x = 0.8479969...

[Ladogaboy]

Hahaha, thank you.

She says that she forgot about the logarithm function. ;)

Anyway, she's not in a math intensive major, so I think some of her skills are a bit rusty. :shrug:

[sho.gun]

hmm I thought the TI-83 doesn't have an equation solver, only the 86 and above. Or maybe I just haven't figured it out yet. Anyway, while we're on the subject of clackulators, I dropped my TI-83 during chem class today and it wouldn't turn on afterwards. It scared the crap outta me cuz I can't afford to spend another $80 on a new one, but then I tinkered with the batteries a bit and after I took out the small backup battery, it started back up again. I lost all my ungrouped programs though, but it works! :D

[coleslaw]

Originally posted by sho.gun
hmm I thought the TI-83 doesn't have an equation solver, only the 86 and above. I think maybe the TI-83+ does. :confused:

[Windsor]

Originally posted by sho.gun
hmm I thought the TI-83 doesn't have an equation solver, only the 86 and above. Or maybe I just haven't figured it out yet. Anyway, while we're on the subject of clackulators, I dropped my TI-83 during chem class today and it wouldn't turn on afterwards. It scared the crap outta me cuz I can't afford to spend another $80 on a new one, but then I tinkered with the batteries a bit and after I took out the small backup battery, it started back up again. I lost all my ungrouped programs though, but it works! :D

Not sure if its the 83+ but the 83's i've worked with do have a solver function. It doesn't even come close to the one on the 89, but its a solver function nonetheless.

[zcloydster]

without a TI 89, i never would have an A in calculus. we had to take our final without calcs though, so i guess im ok...

[ChrisMG187]

Originally posted by Windsor


Not sure if its the 83+ but the 83's i've worked with do have a solver function. It doesn't even come close to the one on the 89, but its a solver function nonetheless. well, the regular 83 doesn't have one, so it must be the 83+. Damn you and your expensive calculator. I'm down here usin a TI-36

[sho.gun]

Yeah, I have the TI-83+... I don't see an equation solver though, there's a command called "solve()" but I can't figure out how to use it. Anyway, I think the easiest way to solve equations is by graphing both sides of the equation and use the intersect function to find where they cross.

just my 2 dollars

[leemaj]

if its anything like the 89, try solve(x+5=10,x) and it should say x=5

[BigJon]

Umm....I didn't use my TI-83 for math....just games.

[Ladogaboy]

Originally posted by sho.gun
Yeah, I have the TI-83+... I don't see an equation solver though, there's a command called "solve()" but I can't figure out how to use it. Anyway, I think the easiest way to solve equations is by graphing both sides of the equation and use the intersect function to find where they cross.

just my 2 dollars

Yeah, I don't know if she has an 83 or 83+, but there is a "solve" command. Neither one of us has taken a serious math class since high school, so I can't even find my way around a TI anymore. :(

[Markel]

Wimps. I used a slide rule through college physics.

[Ladogaboy]

Originally posted by Markel
Wimps. I used a slide rule through college physics.

I saw one of those in a museum once! ;) :P



:heh:

[zcloydster]

a slide rule? just do it in your head like me and leemaj :bandit:

[leemaj]

cloydster and i are calculus masters

[coleslaw]

Man, calculus should not require the use of a calculator. The math is quite simple; it's the concepts that are sometimes difficult for some to grasp.

[zcloydster]

i dont think anyone can calculate the volume of a hyperbolic cross section of a cone in their head... well, im sure some can, but theyre at princeton....so in that concept calculus math IS hard, were not talking ln u/a anymore, or up and under... :johnwoo2:

[coleslaw]

Originally posted by zcloydster
i dont think anyone can calculate the volume of a hyperbolic cross section of a cone in their head... well, im sure some can, but theyre at princeton....bah, triple integrals are a piece of cake! Slap that shizz into spherical coordinates and it's easy! :P

[sho.gun]

dangit you guys, I'm here working my butt off trying to do derivatives and you guys talk about spherical equation mc^2 whatever nonsense!

[Sir_Froggy]

ya u just gotta read all the stuff on ur calculator......or just go to MATH

[zcloydster]

are you talking about by parts and such? im in AB, not yet BC. It's fun. Today we learned why graduation rocks and sucks. And he laughed at our quiz grades :bawl:

[zcloydster]

derivatives arent even fun.... theyre boring :eek: