Roots reggae or roots rock reggae is a type of pure reggae which combines the traditional ska sound with American rock and roll, R&B and pop music. It is the most accessible form of reggae, and the most popular globally, primarily due to the success of superstar singer Bob Marley.
... form of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by the method of completing the square[?]. ...