12+-+Completing+the+Square

Completing the Square:

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Created using GeoGebra 3.2.40.0 GeoGebra - Dynamic Mathematics for Everyone []

Here are a few videos to help:
 * The first video explains the concept of completing the square using the interactive above.
 * The second video shows how to complete the square when the coefficient of the square term is 1.
 * The third video shows how to complete the square when the coefficient of the square term is not 1.

Here's a nice explanation from Glencoe on the topic.

Lastly, here are some notes and examples so you can go through the steps with me.