0580/12 May/Jun 2025, Question 15: Constructing Equations
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Non-calculator · 2 marks
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The question, in short
Find the positive number n that, when squared and then reduced by 55, gives 9.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1n² − 55 = 9
- 2n² = 64
- 3n = 8
Answer8
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