A quadratic is a pretty big word for an almost simple branch of algebra.  Hi, I am Mr. Quadratic and I need your help to destroy my arch nemesis Mr. Linear.  Quadratics can be defined as an expression or equation having a square.  No, not a box, but a squared variable.  For example: x² + 3x + 5 = 0.  The exponent above the first x term indicates a quadratic.  Therefore x² = 49 would also be a quadratic.   These may look disgusting, but with the help of this brilliant, great, wonderful, etc., etc. tutorial, you will soon understand the secrets of the Quadratic, and be able to destroy Mr. Linear and his plane, monotonous, un-exponential ways.

I'm sure you know that x * x = x², and this is the power that will help me bring down Mr. Linear.  The power of 2!, or any number other than 1 for that matter.

For an answer involving {x, -x} we shall use ± x to denote this.

Now you are ready to conquer the evils of straight lines and battle Mr. Linear in the... oh, you haven't had your training yet?  Then click on, apprentice.