The subject of a formula is the variable that is being worked out. It can be recognised as the letter on its own on one side of the equals sign. For example, in the formula for the area of a rectangle ...

Factorising is the opposite process of expanding brackets. A factorised answer will always contain a set of brackets. Factorise \(6x + 9\). To factorise this expression, look for the HCF of \(6x\) and ...

From trigonometry to calculus and vectors to geometry, few students take A-level mathematics thinking it's going to be an easy subject. But for Daily Mail readers who know their sequences from their ...