Category Archives: TI-84 Lessons

TI-84+C Asymptote Detection

ti-84+C asymptote detection

Left–TI-84+C Asymptote detection turned off        Right–Asymptote detection turned on

This isn’t at all a post I was planning to do, but again tonight I had another question on the Tech Powered Math Facebook page about the TI-84+C and asymptotes. If you press 2nd and FORMAT, you’ll find an option called “Detect Asymptotes” that can be turned on or off. The people I’ve heard from seem to assume that this feature will find and define asymptotes for users, but from my experience I don’t believe it functions this way.

Let me preface this by saying that this isn’t a feature that I heard mentioned at any official briefings I received from Texas Instruments or at the T3 International Conference in Philadelphia. However, based on my own experimentation, it appears that asymptote detection will either correctly turn off the trace of the asymptote of a function when asymptote detection is turned on, or it will turn on the trace when asymptote detection is turned off. You can see this in the example above, which is the graph of y=1/(x-2). On the left, I have turned asymptote detection off. On the right, I have turned it on. If I find out I’m wrong and the TI-84+C is capable of actually calculating the asymptotes for the user, I will update this post.

This is also probably as good as time as any to let you know that I am almost done wrapping up work on my TI-Nspire DVD and hope to begin work on my TI-84+C DVD this week. I (optimistically) hope to have them both available for sale by mid-August if not a bit sooner. These are targeted primarily at beginning to intermediate users of these calculators. I know many regular readers of Tech Powered Math are more advanced than that, but I also bet some of you know friends or colleagues who are still getting started and could use a resource like that. Stay tuned because I will have a big but brief kick off sale on both DVD’s when they launch on Amazon for my Facebook, Twitter, and email subscribers.

 

Video Lesson: Tables on the TI-84

The table feature allows you to quickly scroll the an x vs. y chart on your TI-84. This lesson demonstrates how the table can be used from beginning algebra graphs to finding a limit in calculus.Continue Reading

Video lesson: Finding the intersection of two graphs on the TI-84

In this video lesson, you’ll learn how to find the intersection of two graphs on the TI-84+ graphing calculator.Continue Reading

Video lesson: Solving polynomial equations on the TI-84

This video lesson explains how you can use a TI-84+ app to solve a polynomial equation, even ones bigger than a quadratic equation.Continue Reading

Video lesson: Definite integrals on the TI-84

This video lesson covers how to find a definite integral on a TI-84 both within the home screen and within a graph.Continue Reading

Video lesson: Basic graphing features of the TI-84

This video lesson covers and introduction to graphing on the TI-84. Inputting equations, tracing functions, and adjusting the graph window, and using zoom features are all explained.Continue Reading

Video lesson: Imaginary and complex numbers on the TI-84+

This video lesson includes a brief explanation of complex numbers and a tutorial on how to use your TI-84 to do calculations involving complex numbers. Continue Reading

Video lesson: Solving a system of equations with the TI-84+

When you are given multiple equations and multiple variables, a graphing calculator can be a lifesaver. New versions of the TI-84 come with a pre-installed app the makes these problems a snap. This video lesson covers solving systems equations by the elimination, or linear combination method, before covering how to use the TI-84 to solve.Continue Reading

Video lesson: Degrees-minutes-seconds on the TI-84+

If you’re a student of geometry or trigonometry, you’ve probably come across problems involving degrees, minutes, and seconds. This is an alternative to measuring in decimal degrees, and it works a lot like time.Continue Reading