(Specifically Intended for **TI-83** or **TI-84 Plus** Users)

Ever wish that you could have a program on your calculator to do long drawn out formulas for you? With this tutorial you will be able to program formulas into your calculator with ease.

This is for anyone who wants an easier human-error proof way to derive the answer to several formulas. It is especially handy for those among us who are engineers and don’t want to do computation by hand.

You can program any formula that uses inputs into your calculator using this process. You can program formulas such as the formulas for Reynold’s Number, the Quadratic Formula, Antoine’s Equation, the volume of a sphere, Pythagorean Theorem; the possibilities are endless. For demonstration purposes I will be using the coding for the quadratic formula.

**At the bottom of the instructions I have an*"If you messed up really badly"* section that should be noted here just in case you find yourself in a dark abyss with your program and don't know where else to turn.**

**What You Will Need**

-A TI-83 or TI-84 plus calculator (these instructions may work for other calculators as well)

-A copy of your specific formula

-A previously calculated answer for your formula so that you can test out your program to see if it is working correctly

Ever wish that you could have a program on your calculator to do long drawn out formulas for you? With this tutorial you will be able to program formulas into your calculator with ease.

This is for anyone who wants an easier human-error proof way to derive the answer to several formulas. It is especially handy for those among us who are engineers and don’t want to do computation by hand.

You can program any formula that uses inputs into your calculator using this process. You can program formulas such as the formulas for Reynold’s Number, the Quadratic Formula, Antoine’s Equation, the volume of a sphere, Pythagorean Theorem; the possibilities are endless. For demonstration purposes I will be using the coding for the quadratic formula.

**At the bottom of the instructions I have an

-A TI-83 or TI-84 plus calculator (these instructions may work for other calculators as well)

-A copy of your specific formula

-A previously calculated answer for your formula so that you can test out your program to see if it is working correctly

I have outlined several keys that you will be using during this process. I have only highlighted the ones that I feel are used most frequently in this tutorial those that are harder to find. I think it is safe to assume that most are calculator savvy and know where to find keys such as “**ENTER**” and “**CLEAR**”.

<p>So, as I said just a moment ago, this was a VERY helpful Instructable. </p><p>This will be a great help for working through repetitive problems.</p><p>Thanks again.</p>

<p>Your results are incorrect because the order of the numbers in the final step of testing the program is actually 1,3,2 not 1,2,3 (as in, A=1 B=3 and C=2). I had the same problem before I realized that I had read it wrong!</p>

<p>I'm getting some involved notation and imaginary numbers with following your example exactly. I'm guessing its in settings, but fumbling for a few moments has not paid off so far. Any suggestions?</p><p>Also, this is a great Instructable with strong enough descriptions in each step it was enjoyable following along.<br></p><p>Thank you.</p>

<p>How do you get the equal sign after the X under Disp?</p>

<p>press 2nd, MATH and then ENTER</p>