Dr. Philip J. Owens
Adjunct Math Instructor
Austin Community College - Northridge
Permutations and Combinations
Here's what your keypad looks like:
|Press Y=. You will see this screen:|
|This screen lets you define a function by typing it in where the cursor
(black rectangle is).
Press x,T,0 (the key next to ALPHA ) and x 2 (that's 2 keys)
Note that there is no scale indicated, but the default is 1, so each tick mark represents one unit.
You can see what the coordinates of various points on a graph are by tracing.
will place a cursor on your screen, somewhere on the graph.
See the cursor? Note also that the coordinates of the point are given at the bottom of the screen. The cursor is at the point (0,0).
|You can move the cursor using the arrow buttons.
Press the right arrow button (several times)
Note that the cursor has moved (but is tracing the function) and the new coordinates appear.
You may "zoom" in on a particular part of the graph in order to see more detail. There are two ways to zoom.
Way 1 (zoom in around a particular point):
|Place the cursor at the point you wish to zoom in on (I moved it to the
Press ZOOM , to see the following menu:
|Select "Zoom In" (using the down arrow), then
You now see an "expanded" portion of the graph from about x=-2 to 2 and y=-2 to 2
If you want to go back to the previous graph, do ZOOM and "Zoom Out".
Way 2 (pick a particular "boxed area" to zoom in on)
, select "ZBox", and ENTER
. You won't see anything yet, but the calculator is ready for you to
draw your box.
Using the arrows, move to where you want a corner of your box to be, and press ENTER .
|Use the arrow keys to move the cursor to where you want the diagonally opposite corner to be. The calculator will draw a box as you go.|
You now see (full-screen) the portion of the graph within the box.