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Quadratic Equations

Quadratic equations are a type of algebra where x² (x squared) is involved. There's a well-known formula for solving quadratic equations and I'll quote it here.

The usual form of a quadratic is:

And the equation is solved by:

There it is. A classic solution to a well-known mathematical problem. Many other explanations like this can be seen by going to www.google.com and typing "Quadratic" or "Quadratic Equation". But at this site there are practical ideas which involve quadratic equations, for example the Video Tape Counter to Time. There's also a huge amount of other stuff, (see full site index) quite a lot of which isn't about mathematics, so I would guess there are better explanations elsewhere, but then again, looking around, I don't see any brilliant explanations. Maybe some recommendations could help to update this.