Question about Texas Instruments TI-86 Calculator

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How do you use the imaginary number with the TI-84 calculator?

Example problem: finding the solution to a radical (square root of a negative number) using i.

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If you want the answer in rectangular form, set MODE a+bi and tap ENTER and QUIT. Tap square root sign, tap (-)4 and close the parenthesis and tap ENTER. The answer is shown as 2i.
If you want the answer in polar form, set MODE to re^xi and and DEGREE. Tap ENTER and QUIT. Tap the square root sign, tap (-)4, close the parenthesis, and tap ENTER. The answer shown is 2e^90i. (2 at ninety degrees). If you selected RADIAN mode, the answer would be 2e^1.57i (2 at 1.57 radians; or 2 at pi/2 radians)

Posted on Dec 20, 2009

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Hello,
In rectangular form enter a number as (a, b)
SQRT((0,-4)) gives (0, 2); real part 0 imaginary part 2.
Hope it helps.

Posted on Sep 23, 2009

  • k24674 Sep 23, 2009

    Sorry due to the wrong listing of the question I gave you the answer for the TI86. Here is how you do it for TI84. [2ND][CAT] scroll down till you reach a+bi. Click [ENTER]. Command echoes on home screen Press [Enter]. calculator displays Done. Now you are ready to use complex numbers.
    Ex: SQRT(1-i) =1.099-.455i. Set the floating mode to a few digits otherwise you will have to scroll right to see the imaginary part.


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