1. Let's start by stating the problem clearly: "Show the working for question 4." Since the exact question 4 is not provided, please provide the full question or context so I can assist you accurately. 2. Generally, to solve any algebraic or mathematical problem, we first identify the type of problem (e.g., equation solving, factorization, calculus, etc.). 3. Then, we apply the relevant formulas or rules step-by-step, showing all intermediate steps and simplifications. 4. Please provide the exact text or details of question 4 so I can demonstrate the full working with explanations and LaTeX formatting.