Graphing Parabolas In Standard Form
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1Graphing Parabolas
Graph the following parabolas by first finding the vertex and then picking 2 x-values
smaller and larger than the x-value of the vertex.
2
Example: y = x
+ 4x – 4
b
4
4
2
Vertex:
x
2
y = (-2)
+ 4(-2) – 4 = 4 – 8 – 4 = 4 –12 = –8
=
−
=
−
=
−
=
−
2
a
2
) 1 (
2
Vertex = (-2, -8)
x
y
0
-4
-1
-7
-2
-8
-3
-7
-4
-4
2
2
2
1.
y
3
x
24
x
7
2.
y
x
6
x
3
3.
y
2
x
8
x
10
=
−
−
=
+
+
=
−
−
+
2
2
2
4.
4
8
1
5.
6
12
6
6.
2
2
5
y
x
x
y
x
x
y
x
x
=
−
+
−
=
+
+
=
−
+
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