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

Note 4D • Transformations and Compositions (continued) TI-89/TI-92 Plus/Voyage 200
You can use the Home screen recursive loop y1(x)→x to evaluate the repeated
composition of a function with itself. Store a starting value in x, then type
y1(x), press STOÍ , enter x, then press ENTER ENTER ENTER , and so on. (See
Note 1B for more on Home screen recursion.)
Note 4E • TRANSFRM Program
The program transfrm gives you practice finding equations for given
graphs. You have a choice of 1:Parabola (translations of parabolas),
2:Above or Sq Root (reflections and translations of square root functions and
parabolas), 3:Above or Abs Val (stretches, shrinks, reflections, and translations of
absolute values, roots, and parabolas), or 4:Above or Semicircle (the same for
semicircles).
After you select your option, the calculator will display a graph and stop.
Study the graph and determine its equation. When you have decided on
an equation, press ENTER ALPHA , type your equation into the box, and
press ENTER ENTER . If your equation is correct, you’ll have a match and
nothing new will appear on the screen. If your equation is not correct,
the graphs will not match. In that case, press ENTER and try again.
When you are finished with one graph, press ENTER Y ENTER ENTER to run the
program again.
[15.8, 15.8, 1, 7.6, 7.6, 1] [15.8, 15.8, 1, 7.6, 7.6, 1]
The option 5:Generic will draw the graph of a generic function using a thick
line and the graph of its image after a transformation using the regular style.
Type the equation of the image into the box. Use y8(x) to represent the
original function.
[15.8, 15.8, 1, 7.6, 7.6, 1] [15.8, 15.8, 1, 7.6, 7.6, 1]
Clean-Up
After you quit the program, you may want to go to the Y Editor screen
and clear the functions so they don’t interfere with future work.
Discovering Advanced Algebra Calculator Notes for the Texas Instruments TI-89, TI-92 Plus, and Voyage 200 CHAPTER 4 35
©2004 Key Curriculum Press
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