Quadratic expressions can be written in the form , where , and are numbers.

is called the coefficient of and is the coefficient of . is a constant term – it is a number that is not multiplied by the variable .

For example, for the quadratic expression , = 6, = 13 and = 6.

To factorise this quadratic, first multiply the coefficient of by the constant term ( ).

Factorise .

First, multiply the coefficient of by the constant term ( ).