Worksheet: Standard Form, Line Of Symmetry And Vertex Page 3
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1
2
3
4For the following quadratic equations, identify a, b and c, and then find the equation for
the line of symmetry.
2
2
Sample #1:
y
x
6
x
5
Sample #2:
y
2
x
5
x
7
=
+
−
= −
−
+
Answer:
a = ,
1
b = ,
6
c = −
5
Answer:
a = − ,
2
b = − ,
5
c =
7
The line of symmetry:
The line of symmetry:
(6)
( 5)
−
− −
x
x
=
=
2(1)
2( 2)
−
5
x = −
3
x = −
4
2
2
1.
y
x
4
x
12
2.
y
x
10
x
3
=
+
+
=
+
−
2
2
3.
y
x
12
x
4
4.
y
2
x
8
x
5
=
−
+
=
+
−
2
2
5.
y
3
x
6
x
1
6.
y
x
2
x
2
= −
+
−
= −
−
−
2
2
7.
y
x
3
x
8
8.
y
4
x
16
=
+
−
=
−
2
2
9.
y
8
x
10.
y
2
x
7
x
= −
=
−
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