25 and \({x}\) = –25. It is normally quite difficult to accurately plot and read off the solutions to quadratic equations by using a graphical method – so only do this if the question ...

The difference of two squares can be factorised into brackets using the method above for factorising quadratics. Factorise \(x^2 - 4\). Quadratics can be factorised into the form \((x + a)(x + b)\).