SITE-C teams: Lesson 13


This simple lesson lets students discover that the derivative of y = ex is ex.

Turn on the CASIO CFX-9850G by pressing AC/ON.

Use the cursor arrows to highlight the GRAPH menu and press EXE or just press 5 when at the main menu screen.

In the Y1 slot enter eX and press EXE to store it in memory.

Press SHIFT MENU (SETUP), use the down cursor arrow to scroll down and highlight the Derivative line, press F1 (ON) EXIT.

Press SHIFT and F3 (V-Window) to set the parameters as follows:

Xmin = -6.3

Ymin = -6.2

Xmax = 6.3

Ymax = 24.8

Xscale = 1

Yscale = 5


Press EXIT to return to the function list. Make sure that no other Y-slot is highlighted, i.e. selected for drawing. Press F6 (DRAW) to see the graph.

Press SHIFT F1 (Trace). Use the right cursor arrow to move along the curve and notice that the value of dY / dX is always the same as the y-value.

Press EXIT to return to the function list. Use the up or down cursor arrows to move Y2, press OPTN F2 (CALC) F1 (d/dX) VARS F4 (GRPH) F1 (Y) , X ). Use the up cursor arrow to highlight Y2, press F4 (COLR) F2 (Orng) EXIT and F6 (DRAW).

The display shows that Y1 and Y2 are the same function.


Turn off the CASIO CFX-9850G by pressing SHIFT AC/ON (OFF).