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4MA1/2F Jun 2025, Question 10: Ordering and Inequalities

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks

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The question, in short

Lui evaluates 30 − 4x at x = −5 and gets 10, which is wrong. Explain his error, then list all possible values of a positive odd number Y with Y ≤ 9.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Identify the mistake in Lui's substitution and calculation of 30 − 4 × −5.

  1. 1Substitute x = −5: 30 − 4 × −5
  2. 2−4 × −5 = +20 (negative × negative is positive)
  3. 330 + 20 = 50
  4. 4Lui wrote 30 − 20, treating −4 × −5 as −20

Answer−4 × −5 = +20, so it should be 30 + 20 = 50, not 30 − 20

Part (b) · 2 marks

List every positive odd number Y satisfying Y ≤ 9.

  1. 1Positive means greater than 0
  2. 2Odd numbers up to and including 9
  3. 31, 3, 5, 7, 9

Answer1, 3, 5, 7, 9

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