.
Look in these lessons in this site
- Introduction into Quadratic Equations
- PROOF of quadratic formula by completing the square
- Quadratics FAQ (Frequently Asked Quadratic Questions)
- Who is who in quadratic equations
- Solving quadratic equations without quadratic formula
and the entire directory of lessons devoted to quadratic equations
- http://www.algebra.com/algebra/homework/quadratic/lessons/
You can learn a lot from this site.
It is intended for you !
Actually, this site has three faces, three sides, or three components.
(Or even more, four!)
One face is the forum, where you submit your requests/posts and the tutors solve your problems for you (explain you, teach you etc. . . ).
This forum functions just more than than 15 years (probably, about 20 years), and during this time
it accumulated hundred thousands of submitted posts and solved problems. So, the users can search in the database
for the problems identical or similar to those they need to solve.
This is the second face, the second side and the component of the site.
Finally, there are lessons written by voluntarily teachers/tutors that cover
a wide range of School Math subjects and even more.
If you go to the home page www.algebra.com you will see the list of subjects.
Click to each subject, and you will find a bunch of lesson related to this subject.
The fourth component are the solvers developed by the tutors to facilitate calculations.
So, there is almost unlimited and unbounded field for your search and your research in this site.