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CHAPTER 3
Determine the roots and axis of symmetry of the quadratic function
Example 1
=
y
OPERATION
1 . Use the formula
=
x
press
1
1
+
1
1
)
2
X
1
(
2
¡
The first root is 3.
2 . To determine the second root, we use the REPLAY function.
Press
once to return to this display screen on right.
Press
numerous times until the cursor is below the '+' sign.
Now press
–
Followed by the key strokes
The second root is 2.5.
3 . To find the axis of symmetry, press
=
+
3
=
2
¡
The axis of symmetry is
You may scroll through the last nine calculations by pressing the Replay function
Quadratic Functions
2
−
+
2
x
11
x
15
.
2
−
±
−
b
b
4
ac
to determine the roots. While in COMP mode,
2
a
(
À
(
2
x
–
4
=
5
)
X
2
)
=
=
=
x
. 2
75
(–)
X
11+À( (-11)
Ans¡(2X2)
=
11+À( (-11)
11-À( (-11)
Ans¡(2X2)
Ans+3
Ans¡2
2
-4X2X15
12
3
2
-4X2X15
12
2
-4X2X15
10
2.5
5.5
2.75
.
12
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