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EL-9900 Graphing Calculator
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value and delete all data.
Setting the zoom factors to 5 :
Graphing Polynomials and Jumping to Find the Roots
Draw a graph of a polynomial and find the roots by using the Calculate feature.
Find the first root.
2-1
2-2
Example
1. Graph the polynomial y = x
4
+ x
3
- 5x
2
- 3x + 1.
2. Find the four roots one by one.
NotesStep & Key Operation Display
Enter the polynomial
y = x
4
+ x
3
- 5x
2
- 3x + 1
1-1
1-2
View the graph.
Find the next root.
x
-2.47
Y is almost but not exactly zero.
Notice that the root found here
is an approximate value.
x -0.82
6-2
A polynomial y = f (x) is an expression of the sums of several terms that contain different
powers of the same originals. The roots are found at the intersection of the x-axis and the
graph, i. e. when y = 0.
ZOOM
A
ENTER ENTER ENTER 2nd F
QUIT
AA
Y=
4
35
31
5
5
+
—
—
+
a
b
a
b
2nd F CALC
2nd F CALC
GRAPH
Before
Starting
X/
/T/n
X/
/T/n
x
2
X/
/T/n
X/
/T/n