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O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2018 · Q53 Marks

Factorise 25t² – 4.

  1. (a)Factorise 25t² – 4.[1]
  2. (b)Factorise x² - 6x - 3xy + 18y.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

  1. [1] (5t-2)(5t + 2) final answer
  2. [1] B1 for a correct partial factorisation e.g. [-]6(x – 3y) or x(x – 3y) or x(x – 6) or [-]3(xy – 6y), etc.
  3. [1] (x-6)(x-3y) final answer

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About this question

Topic
Algebra and graphs, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source
O-Level Mathematics, May/June 2018 Paper 1 Variant 2, question 5.

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