Graphing Quadratic Functions Worksheet Page 6
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11Graphing from Vertex Form
Another form of a quadratic function is vertex form:
( )
(
)
Vertex form can be very useful because as its name suggests, the vertex can be
easily identified. The vertex of a quadratic function in vertex form is ( , �� ) .
The axis of symmetry is ��
.
9. To graph the function ( )
(
1)
which is in vertex form, do the following:
Step 1: Find the vertex of the graph.
Step 2: Plot the vertex.
Step 3: Draw a dashed vertical line through the vertex. This
represents your axis of symmetry.
Step 4: Find and plot two or three points on one side of the axis of
symmetry.
Step 5: Use symmetry to plot the corresponding points on the
other side of the axis of symmetry.
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