4MA1/2HR Jan 2020, Question 23: The Quadratic Formula and Completing the Square
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 3 marks
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The question, in short
Rewrite 7 − 12x − 2x² as a + b(x + c)² with integer a, b and c, stating the values.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 3 marks
- 1−2(x² + 6x) + 7
- 2−2[(x + 3)² − 9] + 7
- 3−2(x + 3)² + 18 + 7
- 425 − 2(x + 3)²
Answer25 − 2(x + 3)²
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