For those that have youtube blocked at school (I only get 2GB a month bandwidth on this so if it doesn't work check back in a month when the bandwidth resets).
Go to the house of math where you can find much more on completing the square, square numbers and the quadratic itself...
ax2 + bx + c = 0 NOT 2...careless error in notation on my part.
the quadratic formula.
square roots...but you know what happens when you assume.
Eventually I'll have a post showing how to draw some of these and combine pictures with symbols so you can see the transition. It should also become obvious why schools who have incorporated this system of teaching didn't just score high they scored better than any school had ever scored on standardized tests...and then politics got involved and the school didn't want to admit they were using Mortensen Math, they just wanted people to know they had a math system that produced high scores and that you should send your kids there...
Anyhow, you can learn a lot of math at the house of math for FREE and some of the algebra on the password protected pages costs just a few bucks.
Need help with the basics like distributive theory click here.
The House of Math on FaceBook.
The House of Math
Learn a lot of algebra for a buck.