This prompt is an example of a template that could develop out of the solving equations inquiry. Alternatively, the teacher could give the prompt to a class that already has experience of solving equations. Other templates for an inquiry could include:
The inquiry has also been developed into solving quadratic equations by factorisation and completing the square (see box below). If a teacher uses the solving equations prompt first, it is advisable to introduce an advanced template by linking it to a student's question or observation from the initial prompt. In this way, students retain ownership of the inquiry process and, in consequence, remain more motivated to develop their mathematical understanding.