The GCSE maths question that the parents failed shows a shape with all its measurements in centimetres, where the area of the shape is A cm² and respondents are asked to show that A = 2x² + 24x ...

"If you're sitting GCSE Maths this year, this is one of the hardest types of changing the subject that you might get," the teacher said. "We want to make m the subject, but it appears on both ...