4MA1/1HR Jan 2020, Question 6: Solving Quadratics by Factorising
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 3 marks
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The question, in short
Solve the quadratic equation x² − 5x − 36 = 0, showing clear algebraic working.
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Solution · 3 marks
- 1Find two numbers that multiply to −36 and add to −5: −9 and 4
- 2Factorise: (x − 9)(x + 4) = 0
- 3x = 9 or x = −4
Answer9, −4
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