1. The quadratic formula is derived from completing the square, as shown on this site.

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1. The quadratic formula is derived from completing the square, as shown on this site.
http://www.sosmath.com/algebra/quadraticeq/quadraformula/quadraformula.html
 

There are many other sites that explain the quadratic formula.  Find one of your own and share it with the class.  Explain its contents.


2.  Why is the quadratic formula useful?

 

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