CHAPTER 4 Calculator Notes for the TI-89, TI-92 Plus, and Voyage ...

Note 4C • Friendly Windows (continued) TI-89/TI-92 Plus/Voyage 200
2:ZoomSto. Now when you want to use it again, press ♦ [GRAPH] F2 (Zoom)
B:Memory 3:ZoomRcl. This particular window is often referred to as the
friendly window with a factor of 2.
It is sometimes helpful to see the grid in the background of the screen
display. To turn the grid on (or off), go to the Graph or Y Editor screen
and press F1 (Tools) 9:Format..., and set Grid OFF or ON.
[15.8, 15.8, 1, 7.6, 7.6, 1]
Note 4D • Transformations and Compositions
You can use functions entered into the Y Editor screen in other functions
to show transformations and to construct compositions.
Transformations of Functions
You can enter an equation into the Y Editor screen and then define a
second equation as a transformation of the first. For example, enter 4x 2
into y1 and define y2 as y23*y1(x4)2. y2 is the image of y1 after being
stretched vertically by a factor of 3, translated right 4 units and up 2 units.
[15.8, 15.8, 1, 3.8, 15.2, 1]
Compositions of Functions
If you enter two (or more) equations into the Y Editor screen, you can
define another equation as the composition of the equations you have
entered. For example, enter 4x 2 into y1 and x5 into y3. Define y4 as the
composition of y1 and y3 by entering y4 y1(y3(x)).
[15.8, 15.8, 1, 7.6, 7.6, 1]
(continued)
34 CHAPTER 4 Discovering Advanced Algebra Calculator Notes for the Texas Instruments TI-89, TI-92 Plus, and Voyage 200
©2004 Key Curriculum Press