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O-LevelAdditional MathematicsQuadratic functions4037/22 · Oct/Nov 2012 · Q34 Marks

Solve the inequality 4x(4 – x) > 7.

  1. Solve the inequality 4x(4 – x) > 7.[4]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2012). The mark or mark type is shown in brackets.

  1. [M1] Rearrange to ax² + bx + c [= 0]
  2. [M1] (2x-1)(2x-7)[<0]
  3. [A1] 0.5 and 3.5
  4. [A1] 0.5 < x < 3.5

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About this question

Topic
Quadratic functions, O-Level Additional Mathematics (syllabus 4037). Structured question, 4 marks.
Source
O-Level Additional Mathematics, Oct/Nov 2012 Paper 2 Variant 2, question 3.

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