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Graphing Calculators

Graphing Calculators. A useful tool. What are graphing calculators?. (Formerly) tiny computers – you can even program them. TI-83+, TI-84+, TI-89 are the ones with which I am most familiar.

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Graphing Calculators

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  1. Graphing Calculators A useful tool.

  2. What are graphing calculators? • (Formerly) tiny computers – you can even program them. • TI-83+, TI-84+, TI-89 are the ones with which I am most familiar. • There are others, but Texas Instruments (TI) has a bit of a chokehold on the industry (or at least that’s what the $90 price on the TI-83+ seems to indicate). • Can’t I just use my cell phone/an app? • Not on the SAT, ACT, or college, ever.

  3. How to use it • Parenthesis! This thing always follows order of operations. • Put that in your calculator. What do you get? • You can go back and modify what you typed by using “2nd“+ “ENTER” (which is “ENTRY”) and put things in using “2nd” + “DEL” (which is “INS”) – it pushes the thing it’s on to the right.

  4. Multiple-step problems • If your science teacher gives you a problem that leads into the next problem, or a lab whose work builds on itself, use “2nd” + “(-)” (“ANS”) and the Ans that appears on the screen will use whatever answer value appeared most recently. • This also means if you screw it up you have to redo the first step, because it will keep using the most recent answer • Type in “Ans + 2” and press Enter a few times.

  5. Lesser-used functions • Common functions – squaring, square roots, sin/cos/tan, log, ln, π, e, these are all available on buttons. • “MATH” button includes most of everything else you could need. • Try putting in

  6. MODE • The thing you’ll use the most here is • Radian Degrees • This determines what units it thinks you’re using for trig. • Highlight radians, then type in sin(π) • Highlight degrees, then type in sin(π)

  7. Graphing • Y= • X, T, θ, n • x2 • GRAPH • “2nd” + “GRAPH” = “TABLE” • You can view a T-chart here

  8. Graphing • WINDOW lets you define the edges of the screen • ZOOM lets you generically zoom in or out – if you aren’t sure how far off your window is • “2nd” + “TRACE” = “CALC” • This lets you do graph-calculations, like find roots, maximums and minimums, derivatives, and integrals

  9. Solving • Built-in solver • “MATH” • Option “0” • If you have a single-variable equation and set it equal to zero, your calculator will solve it. • WARNINGS • It only gives you one answer • It iterates, so sometimes it gives decimal

  10. Solving • Try x2 – x + 20 = 0 • (You have to use “ALPHA” + “ENTER” = “SOLVE”) • What answer did you get? • The number that’s in the X= spot is where it starts. • Try 4 • Now try 6

  11. QUADFORM • You can write a short program that will perform the quadratic formula for you. • http://math.arizona.edu/~krawczyk/Calculator/TI83PLUS/TI83PQF.html • It won’t give you imaginary answers – you could program a bunch more in to make it look like it did that, but the calculator is not equipped to actually deal with imaginary values.

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