Good question: think of these as different models of the same design. The TI-84+ was first and had an LCD display. Then, the CE model (in this video) came along with a sleeker design and a backlit color-pixel display. The operating system received some minor updates so that some functions and operations were presented closer to the fonts and prints used in textbooks. In addition, the CE model has a rechargeable battery.
@@daniel-xt3tpwell, yes, it can do basically everything that the CE model can do. However, if you are looking to plug in Algebra equations and have it solve them for you, you will need to learn how to calculate intersections using the graphing feature.
You would need to graph the top half and bottom half separately, using Y1= and Y2= the equations would be sqrt(r^2 - x^2) and -sqrt(r^2 - x^2), respectively, where r is the radius of your circle.
