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O-LevelMathematicsAlgebra and graphs4024/11 · May/June 2015 · Q174 Marks

Factorise completely 3 - 12a².

  1. (a)Factorise completely 3 - 12a².[2]
  2. (b)Factorise x² - 6y + 2xy - 3x.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

  1. [2*] 3(1 - 2a)(1 + 2a)
  2. B1 for 3(1 - 4a² ) or (1 - 2a)(1 + 2a) seen
  3. [2*] (x - 3)(x + 2y)
  4. B1 for any (partial) factorisation of x² + 2xy ; x² – 3x ; −6y + 2xy ; −6y – 3x

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About this question

Topic
Algebra and graphs, O-Level Mathematics (syllabus 4024). Structured question, 4 marks.
Source
O-Level Mathematics, May/June 2015 Paper 1 Variant 1, question 17.

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