(adsbygoogle = window.adsbygoogle || []).push({}); For this you need to have a TI-82 or up calculator. I'm assuming most people will probably have the TI-83+ so I'm going to make the tut for that. If you have a different model the coding is probably either the same, or slightly different (for example I have a ti-89 titanium as well, and the coding is almost exactly the same).


1. Click the PRGM button.
2. Go to "New" and create a new program.
3. Name it "QUADEQ" or something to that effect.
4. There are a couple commands that you will need. To find the list of commands, click the PRGM button again. The "→" symbol is the store (STO→ command and can be found right above the ON button. The = sign can be found by pressing 2nd and then MATH.
5. Enter this code exactly:

    :ClrHome

isp  "FOR AX^2+BX+C=0:"

rompt A

rompt B

rompt C

:√(B^2-4*A*C)→

-B+D)/(2*A)→M

-B-D)/(2*A)→N

isp  "SOLUTIONS:",M,N

:

6. Press 2nd MODE to quit.
7. Press PRGM and open the program you just made under the EXEC tab.
8. Now when you have a quadratic equation in standard form (ax^2+bx+c=0) just enter the values of a, b, and c.
9. Test it out to see if it works. Try a simple equation like x^2+2x+1=0 (so you would enter 1, 2, and 1 in the calculator). The answers for that one should be -1 and -1.

School is over man.

nice post. I'll use this for tests, because it's a lot faster than having to find the solutions from a graph or by factoring. I used to be good at programming calculators, but now i forgot everything I knew.

My brain hurt :confused:

lmao wtf O_o

O cmon, my TI-82 just broke!,

Really nice post elfmotat, I wish I knew about this when doing Algebra 2 with trig..

I had a TI-89 silver edition but it was stolen. Those things are expensive, too..

Would this work for different types of quadratics like

3x^2 +6x+2=0

and

5x^4+3x^3+5x^2+2x+7=0
?

the first one would work, but the second one is a quartic equation so it wouldn't work. basically what it is, is doing the quadratic formula for you automatically. i tried making a cubic equation solver once, but i kept getting nonreal answers . ill see if i can get one working though.

Yeah thats what I suspected.

I seem to get +2i, -2I(and answers like that) for a lot of the cubic ones. Try looking in your math book for equations that have answers of not i and try that. Mybe define an imaginary/nonreal as i in the calculator?

What language is this in anyways?

ya, i might try and define √(-1) as i. maybe have something like

If D=imag
D/√(-1)→E
Disp E "i"

the language is TI-BASIC.