Today's lesson is about the most common middle school concept we've covered for almost 3 months. It has shown up 15 times so far this year, with a median placement at question # 74.
Like our Facebook Page (https://www.facebook.com/numberdojo/) if you want to see new number sense posts on your wall. I will reward you with a free concept index or flashcard file of your choice. Thank you!
Number Dojo Level: 312
We should probably start with some definitions...
- The roots of a polynomial are its solutions (or zeros)--the inputs which produce an output of 0.
- The discriminant is a function of the polynomial's coefficients. When written as
- The polynomial has 2 real roots if the discriminant is positive,
- The polynomial has 1 real (double) root if the discriminant is zero, and
- The polynomial has 0 real roots if the discriminant is negative.
Also grouped into this concept is the occasional problem where you are asked to identify a specific root. One way to do this is to factor the polynomial--which is covered by Khan Academy here.