Pre-Calculus - Building the quadratic formula

This video goes through the process of building the quadratic formula by completing the square on a general quadratic equation. If you are not familiar with the method of completing the square, don't forget to check out that video first. Remember when going through this process to simplify where possible and carefully keep track of all your terms.

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[garyward]

As far as I can see, you didn't skip over any of the steps! Congratulations. Anticipating all questions is a great way to teach.

[sky-xkbe]

simple, short and clear tutorials ...thx a lot

[KararEsamAkram]

many thanks ... you helped me a lot <3

[orhunkdak]

how can you know that if the 2a is minus or positive?

[aucourant]

I wish you would complete the number 4. It sometimes looks like a 9 and sometimes like a 7.