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7
Basic Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Press Y= and clear old expressions.
2. Enter the functions for Y1 and Y2. For example, enter f(x)=2x + 1 for Y1 and
g(x)=x
2
for Y2 by moving the cursor to Y1 and pressing 2 x + 1 ,
press ▼ to move the cursor to Y2, and press x x
2
.
3. Press 2ndF QUIT CL to return to and clear the calculation screen.
4. To evaluate (f+g)(4), first store 4 into the X variable by pressing 4 STO
x ENTER .
5. Evaluate (f+g)(4) by pressing 2ndF VARS A 1 (Y1) + 2ndF
VARS 2 (Y2) ENTER . This can be repeated for (f-g)(x), (fg)(x), and
(f/g)(x).
6. Another way to conduct an operation on functions and evaluate it for a value
is to use Y3. Press Y= and enter the operation (f-g)(x) into Y3 by pressing
2ndF VARS 1 (Y1) – 2ndF VARS 2 (Y2). Press 2ndF
QUIT CL to return to and clear the calculation screen. Press 2ndF
VARS 3 Y3
(
4
)
ENTER .
OPERATIONS ON FUNCTIONS
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