4MA1/2HR Jun 2019, Question 22: The Quadratic Formula and Completing the Square
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 4 marks
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The question, in short
Express the quadratic 5 + 12x − 2x² in completed-square form a + b(x + c)², with a, b and c as integers.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 1−2(x² − 6x) + 5
- 2−2[(x − 3)² − 9] + 5
- 3−2(x − 3)² + 18 + 5
- 423 − 2(x − 3)²
Answer23 − 2(x − 3)²
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