Sharp EL9900 manual For Y1 = Y1 2 for Y2, and y = -Y1 -2 for

EL-9900 Graphing Calculator

Step & Key Operation Display Notes

2-2

Enter y = √

6 - x 2 + 2x

for Y1,

y = Y1 - 2 for Y2, and y = -Y1 -2 for

Y3.

Y=

CL

2nd F

√

6

—

X/ /T/n

x2

2

+

X/ /T/n

ENTER

CL

2nd F

VARS

A

ENTER

1

—

2

ENTER

1

2

-

2nd F

VARS

ENTER

—

( )

2-3

"Turn off" Y1 so that it will not

graph.

ENTER

2-4Adjust the screen so that the whole graph is shown. Shift 2 units down- wards.

WINDOW (3 times) — 2 ENTER

— 2 ENTER GRAPH

Notice that if you enter

y = √ 6 - x 2 + 2x - 2 for Y1 and y = - Y1 for Y2, you will not get the graph of a circle because the “± ” does not go with the “-2”.

Notice that “=” for Y1 is no longer darkened. You now have the top portion and the bottom portion of the circle in Y2 and Y3.

-1.3 < Y < 3.1

➝

-5.1 < Y < 1.1

Graphing circles can be performed easily on the calculator display.

12-2