27/08/2026
Think proof questions are just about writing down algebra neatly? This IAL P2 question is a good example of why proof can be difficult at A-level, especially when inequalities and counterexamples are involved.
In this video, we work through Pearson Edexcel International A-level Pure Mathematics 2, June 2022, Question 5, step by step. We look at how to structure the algebraic proof, use the inequality carefully, and then deal with the counterexample in part (b).
This is excellent practice for A-level Maths students because examiners reported that most candidates could not score more than 3 out of the 6 marks available. The question tests not only algebra, but also whether you can write a convincing argument and recognise when a statement is not always true.
A really useful revision example for anyone preparing for IAL P2 and wanting more confidence with proof, inequalities, counterexamples, and the kind of reasoning that often separates stronger answers from incomplete ones.