10-2 Graphing with the Sketch Function. Casio FX-9750G

10-2 Graphing with the Sketch Function

The sketch function lets you draw lines and plot points on a graph that is already on the screen.

All the examples in this section that show operations in the STAT, GRAPH, TABLE,

RECUR, and CONICS Modes are based on the assumption that the following function has already been graphed in the GRAPH Mode.

Memory Area Y1 = x ( x + 2)( x – 2)

The following are the View Window parameters used when drawing the graph.

Xmin = –5 Ymin = –5

Xmax = 5

Xscale = 1

Ymax = 5

Yscale = 1 k Tangent

This function lets you draw a line that is tangent to a graph at any point.

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To draw a tangent in the GRAPH or TABLE Mode

Example To draw a line that is tangent to point ( x = 2, y = 0) of y = x ( x + 2)

( x – 2)

1. After graphing the function, display the sketch menu and press 2 (Tang).

!4

(Sketch) 2 (Tang)

2. Use the cursor keys ( f

, c

, d

, e

) to move the pointer the position of the point where you want to draw the line.

e ~ e

3. Press w to draw the line.

w

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