Vertex form can help us tremendously when graphing a quadratic function, it tells us where the vertex belongs and where the line of symmetry is located. There is a very specific form for vertex form and it relies heavily on completing the square. This will be an important tool for you to use moving forward. Visit that page, watch some videos in order to review how to complete the square if this is foreign to you.
Practice graphing vertex form and completing the square by clicking the activity below. This is homework if not completed in class.
Some folks have requested additional practice for completing the square. CLICK HERE for a practice worksheet that might be helpful in practicing completing the square.