Graphing polynomials and finding the roots – Sharp EL-9900 User Manual
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Advanced Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Graphing a polynomial and jumping to find the roots
1.
Press Y= CL to return to and clear the Y1 prompt.
2.
To enter the polynomial y = x
4
+ x
3
–5x
2
–3x + 1, press X/
θ/T/n a
b
4
+ X/
θ/T/n a
b
3
–
5 X/
θ/T/n x
2
– 3 X/
θ/T/n + 1 .
3.
View the graph in the decimal viewing window by pressing ZOOM
A (ZOOM) 7 (Dec).
4.
Press TRACE and move cursor to the left of the left-hand root. Press 2ndF
CALC to view the calculate menu.
5.
Press 5 (X_Incpt) to find the left-hand root.
6.
Press 2ndF CALC 5 (X_Incpt) to find the next root.
7.
Press 2ndF CALC 5 (X_Incpt) to find the next root.
8.
Press 2ndF CALC 5 (X_Incpt) to find the next root.
GRAPHING POLYNOMIALS AND
FINDING THE ROOTS
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