1. **Stating the problem:** Solve exercice 2, question 3, part a. Since the exact problem statement is not provided, please provide the full problem text for precise assistance. 2. **Formula and rules:** To solve algebraic problems, we typically use operations such as addition, subtraction, multiplication, division, factoring, and applying algebraic identities. 3. **Intermediate work:** Without the problem statement, intermediate steps cannot be shown. 4. **Explanation:** Please provide the full text of exercice 2, question 3, part a, so I can guide you step-by-step.