Sometimes in algebra you will use the initial letter of a word to stand in for that word. For example, the area of a square can be found by multiplying the length by the length.

Factorising is the reverse 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 9 ...