Graphing quadratic functions in vertex form

Graphing a quadratic function in vertex form can be done easily when you understand the following:

What does the "a" value tell us about the quadratic function?
How to find the y-intercept?
How to find the vertex?
How to find the x-intercepts?

Some images made using Geogebra.

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0:00 Introduction
0:20 General steps to graph vertex form
1:12 Example 1
4:16 Example 2
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