The cross method is a step-by-step technique used to factorise quadratic expressions efficiently. It helps find two factors that can multiply together to get the original expression. The quadratic expression must be in the form \(ax^2+bx+c\).

Note that not all quadratic expressions can be factorised using the cross method. In a future course, we will learn how to use the quadratic formula to determine the factors of any quadratic expression.