The quadratic formula, discovered independently by many ancient scholars ... concluding with a proof of the fundamental theorem of algebra. The book is designed for self-study, with exercises and ...

A formula is a mathematical rule or relationship that uses letters to represent amounts which can be changed – these are called variables. For example, the formula to work out the area of a ...

A formula is a mathematical rule or relationship that uses letters to represent amounts which can be changed – these are called variables. For example, the formula to work out the area of a ...

Fertility specialists have found a way for women to have babies without men. It involves a cocktail of chemicals acting as an 'artificial sperm' to trick a human egg into forming an embryo.