Question about Texas Instruments TI-86 Calculator

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I am working with expressions in Algebra that require me to work problems in the form of a+bi,using imaginary numbers. How do I use a TI-86 calculator to work the problem. I have been trying to put them in as ordered pairs and it sends me an error message. What do i do

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  • kakima Sep 02, 2010

    Are you putting the ordered pairs inside parens? For example, the complex number 1+2i should be entered as ( 1 , 2 )

    Also, check the complex setting to make sure you have rectangular instead of polor form selected. Press MODE, then scroll down to the line containing RectC and PolarC, highlight RectC, press ENTER, then EXIT.

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Having gone over a month without a response to my query, I assume my suggestions solved the problem.

Posted on Oct 11, 2010

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2 Answers

How would I factor using a TI-86?


its round has lots of squares and has a handle

Sep 11, 2013 | Texas Instruments TI-86 Calculator

1 Answer

How to factor


The TI 86 calculator does not manipulate algebraic expressions. If does not have a Computer Algebra System or CAS. Try the TI 89 Titanium, TI92/92PLUS, Voyage 200 PLT, TI Nspire CAS, TI Nspire CX CAS. In Casios you have the ClassPad series (300, 300Plus, 330 Plus and the latest 400. The ClassPad 400 has a color screen. It is also orientable portrait or landscape. Other Casios are the Algebra FX 2 and 2, and the FX 9860 G Plus/ SD. In HP you have HP 50G, HP49C, HP49G+.

Sep 11, 2013 | Texas Instruments TI-86 Calculator

1 Answer

Complex number


Try entering on the same command line your calculation followed by the ToFrac command. That should work. Here is a screen capture from a TI83Plus in complex mode (a+ib).

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Aug 26, 2013 | Texas Instruments TI-84 Plus Calculator

1 Answer

Ti-84plus keypad for ti-nspire w/touchpad while in a+bi mode i enter the the problem (2-5i) / (1-6i). once i press "ENTER" i get a decimal. i want the answer in frac form, but when i press...


Here is screen capture of the calculation, performed on TINspire with TI 84 plus keyboard.To type in the imaginary unit use key sequence [2nd][dot], do not use [ALPHA][X^2] for the letter I.
k24674_90.jpg,

Jun 09, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Not working right in my precalc class. I switched mode to a+bi and then did the following problem (3+i)/(5+3i).....it gave me an answer in decimals. Teachers wanted it in fraction form. When i tried to...


  1. From the calculator there is no solution. It just cannot do it because it does not have a Computer Algebra System or CAS. To have a CAS, Get the TINSPIRE CAS calculator.
  2. From you, there is a solution.You must multiply the numerator and denominator of your fraction by the conjugate of the denominator (5-3i).
  3. Thus your expression becomes [(3+i)(5-3i)]/[(5-3i)(5+3i)]
  4. After you expand and separate into real and imaginary parts, you get
  • Numerator= 18-4i
  • Denominator = 34
  • Reduced result is 9/17 -2i/17.

Believe me, it is much easier to do it by hand than try to get the calculator do do something it was not designed for. And doing certain calculations by hand DOES foster true understanding. Now it is up to you.

Feb 22, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Does my ti-86 solve sq. root problems


Yes, your Ti 86 should solve square root problems. At the HOME screen press [CLEAR] [2nd] [x^2] which gives the (Square Root Symbol) to display at the Home screen. Then enter the number you want the square root of and close the bracket [ ) ] and, press the [ENTER] key.

You can even get the square root of complex numbers too. Select the correct complex format in the mode settings. For example: I'll do one in the rectangular form by enter a number as (a, b). I then will go to [2nd] [MODE] then [Arrow down] 3 times and make sure the RectC is highlighted and selected. Then quit out of the mode settings screen and enter [CLEAR] [2nd] [x^2] [ ( ] [9] [ , ] [ - ] [4] [ ) ] [ ) ] [ENTER], this displays the SQRT((9,-4)) equals (3, 2); The real part is 3 and the imaginary part 2.

Jan 09, 2011 | Texas Instruments TI-86 Calculator

2 Answers

How do I convert between the rectangular and polar form of a number with imaginary values? i.e. I want to take the number a+bi and convert it to polar D<(angle) and vice versa.


Use the >Rec and >Pol commands. They're in the Complex number menu, accessible through 2nd [CPLX] MORE.

[CPLX] is the shifted function of the 9 key.

Dec 10, 2010 | Texas Instruments TI-86 Calculator

1 Answer

Where is the i button on the TI 86?


There isn't one. If you're entering a complex number in rectangular form, separate the real and imaginary parts with a comma (left of the 4). If you're entering a complex number in polar form, separate the magnitude and the angle with the angle symbol (2nd comma).

Sep 14, 2010 | Texas Instruments TI-86 Calculator

1 Answer

How do i put the ti-86 in the mode where i can use imaginary numbers. I look in the mode options and still cant find the real number button


From the lack of a response I'm going to assume this is no longer a problem. If it is, please post a comment with further details.

Jan 25, 2010 | Texas Instruments TI-86 Calculator

2 Answers

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


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)

Mar 09, 2009 | Texas Instruments TI-86 Calculator

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