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O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2022 · Q124 Marks

12 Expand and simplify. (a) 3(2x+1)-2(4x+3) (b) (x+5)(x-3)

  1. (a)3(2x+1)-2(4x+3)[2]
  2. (b)(x+5)(x-3)[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

  1. [2] -2x-3 or -(2x + 3) final answer
  2. M1 for 6x + 3 - 8x - 6 or for answer -2x + k or kx - 3
  3. [2] x² + 2x - 15 final answer
  4. B1 for 3 terms out of x² + 5x - 3x - 15 soi

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About this question

Topic
Algebra and graphs, O-Level Mathematics (syllabus 4024). Structured question, 4 marks.
Source
O-Level Mathematics, Oct/Nov 2022 Paper 1 Variant 1, question 12.

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