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10/30/2020 2:42:12 PM
Posted: 11/19/2008 5:02:24 PM EST
Need to do some complex numbers calculations and I wanna use my new TI-89....

How would I enter (5-i10)(10+i30) / 15+i20


and get 10-i10  for an answer?



I know where the "i" is at but when I tried entering it all in, I got some bizarro answer.


HALP!!!!!!!!!!


Link Posted: 11/19/2008 5:04:03 PM EST
I haven't used one since maybe 2000 and a friend is borrowing mine...  But it should be in Mode.  I think you need to set it to Exact.
Link Posted: 11/19/2008 5:09:32 PM EST
[Last Edit: 11/19/2008 5:12:03 PM EST by simplemitch]
Ok, that helped a little. Now I get 2+14i as an answer.


What might I have done wrong?


Nevermind.... I hit a plus instead of minus...


YOU FUCKING ROCK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!­!!!!!!!!!!!

Thanks a billion!!!!




ETA: You're so F'n cool I used post 2000 to thank you!!!!!!!!!!!!
Link Posted: 11/19/2008 5:13:33 PM EST
ha, no problem.
Link Posted: 11/19/2008 5:16:59 PM EST
[Last Edit: 11/19/2008 5:21:32 PM EST by USGI_45]
My prof wouldnt even let us use a calculator for a problem like that


ETA unless you are in a math class that i is something other than just a normal variable....what math class are you taking?
Link Posted: 11/19/2008 5:21:40 PM EST
Be a man, buy an HP 48.
Link Posted: 11/19/2008 5:22:39 PM EST
Originally Posted By USGI_45:
My prof wouldnt even let us use a calculator for a problem like that


ETA unless you are in a math class that i is something other than just a normal variable....


Heh, no. It's complex numbers (rectangular form) . "i" is an imaginary number (the square root of -1).

Engineering fun!!!!!!!!!!!!

Link Posted: 11/19/2008 5:23:54 PM EST
Originally Posted By simplemitch:
Originally Posted By USGI_45:
My prof wouldnt even let us use a calculator for a problem like that


ETA unless you are in a math class that i is something other than just a normal variable....


Heh, no. It's complex numbers (rectangular form) . "i" is an imaginary number (the square root of -1).

Engineering fun!!!!!!!!!!!!





Oh lol, my math skillz are lacking. Where are you going to school?
Link Posted: 11/19/2008 5:24:13 PM EST
Originally Posted By scrybe:
Be a man, buy an HP 48.


LOL, Que?

Link Posted: 11/19/2008 5:26:36 PM EST
Originally Posted By USGI_45:
Originally Posted By simplemitch:
Originally Posted By USGI_45:
My prof wouldnt even let us use a calculator for a problem like that


ETA unless you are in a math class that i is something other than just a normal variable....


Heh, no. It's complex numbers (rectangular form) . "i" is an imaginary number (the square root of -1).

Engineering fun!!!!!!!!!!!!





Oh lol, my math skillz are lacking. Where are you going to school?


CMU, here in Mt. Pleasant. It's a shitty school, but it's conveniently located (about 4 blocks from my house ).

My wifes 1 semester from finishing her Masters in Counseling and with any luck, she'll get a position at a University like ASU or UNLV and we con move somewhere friggin warm and I get to finish school for free!

Link Posted: 11/19/2008 5:28:53 PM EST
Originally Posted By simplemitch:
Originally Posted By scrybe:
Be a man, buy an HP 48.


LOL, Que?



RPN language.

Disregard.
Link Posted: 11/19/2008 5:30:12 PM EST
Originally Posted By gaspain:
Originally Posted By simplemitch:
Originally Posted By scrybe:
Be a man, buy an HP 48.


LOL, Que?



RPN language.

Disregard.


Reverse Polish something-or-other...... Old stuff, yeah?

Link Posted: 11/19/2008 5:40:50 PM EST
[Last Edit: 11/19/2008 5:45:56 PM EST by simplemitch]
edit. nevermind.... i got this one.
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