To factorise an expression means to 'put into brackets' by taking out common factors. When factorising, always take the largest factors possible out of the expression.
Example 1 - Factorising simple linear expressions
a) Factorise: 3x+93x+9.
Notice 3 is both a factor of 3x3x and 99. We can factorise the expression by taking the 33 outside of the brackets.
