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02-12-2002, 11:21 AM
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
02-12-2002, 11:31 AM
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.

02-12-2002, 11:39 AM
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
02-12-2002, 11:40 AM
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...

02-12-2002, 11:54 AM
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
02-12-2002, 04:22 PM
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
02-12-2002, 07:28 PM
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
02-12-2002, 08:17 PM
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
02-12-2002, 08:19 PM
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
02-12-2002, 08:26 PM
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
02-12-2002, 09:13 PM
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
02-13-2002, 03:07 AM
if its anything like the 89, try solve(x+5=10,x) and it should say x=5

BigJon
02-13-2002, 07:54 AM
Umm....I didn't use my TI-83 for math....just games.

02-13-2002, 01:25 PM
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
02-13-2002, 01:40 PM
Wimps. I used a slide rule through college physics.

02-13-2002, 02:04 PM
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
02-13-2002, 07:36 PM
a slide rule? just do it in your head like me and leemaj :bandit:

leemaj
02-13-2002, 07:38 PM
cloydster and i are calculus masters

coleslaw
02-13-2002, 08:16 PM
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
02-13-2002, 08:33 PM
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
02-13-2002, 08:36 PM
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
02-13-2002, 08:52 PM
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
02-13-2002, 10:49 PM
ya u just gotta read all the stuff on ur calculator......or just go to MATH

zcloydster
02-15-2002, 02:38 AM
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
02-15-2002, 02:42 AM
derivatives arent even fun.... theyre boring :eek: