4MA1/2H Jun 2025, Question 19: Quadratic inequalities
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 3 marks
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The question, in short
Solve 4x² + 4x − 15 < 0 using algebra.
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Solution · 3 marks
- 14x² + 4x − 15 = 0
- 2(2x − 3)(2x + 5) = 0
- 3Critical values x = 1.5 and x = −2.5
- 4The quadratic is negative between its roots
- 5−2.5 < x < 1.5
Answer−2.5 < x < 1.5
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