SOLUTION: I was wondering how to do complex algebra in my TI-84 calculator. Specifically algebra with real and complex components like (a+bi)(c+di) and other algebraic processes of complex

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Question 324554: I was wondering how to do complex algebra in my TI-84 calculator. Specifically algebra with real and complex components like (a+bi)(c+di) and other algebraic processes of complex numbers in this form.
Found 2 solutions by stanbon, Edwin McCravy:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
I was wondering how to do complex algebra in my TI-84 calculator. Specifically algebra with real and complex components like (a+bi)(c+di) and other algebraic processes of complex numbers in this form.
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Hit the MODE button
Select the "a+bi" that is 7 lines from the top
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Notice that "i" is above the decimal point button.
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Practise: (2+3i)(2-3i) = 13
(2+3i)(2+3i) = -5+12i
===========================
Cheers,
Stan H.

Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
I was wondering how to do complex algebra in my TI-84 calculator. Specifically algebra with real and complex components like (a+bi)(c+di) and other algebraic processes of complex numbers in this form. 

Press MODE

Press the down arrow 6 times until you scroll
down to the line that says

REAL   a+bi   re^qi

Press the right arrow to highlight a+bi

Press ENTER

Press 2ND

Press MODE

Now the calculator will allow you to do complex numbers.
(It will still do all the ordinary operations as always,
so you can just leave it in the a+bi mode forever.

To type the number i,

Press 2ND
then
Press  .   (that's the "period" or "decimal" key, 
            the middle key on the very bottom row)  
Edwin