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O-LevelAdditional MathematicsQuadratic functions4037/21 · May/June 2019 · Q13 Marks

Find the values of x for which x(6x + 7) ≥ 20.

  1. Find the values of x for which x(6x + 7) ≥ 20.[3]

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

  1. [M1] 6x² + 7x - 20 [*0] (where * may be any inequality sign or =)
  2. [A1] Critical values 4/3, -5/2
  3. [A1] x <= -5/2 or x >= 4/3 final answer (FT their critical values using outside regions)

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About this question

Topic
Quadratic functions, O-Level Additional Mathematics (syllabus 4037). Structured question, 3 marks.
Source
O-Level Additional Mathematics, May/June 2019 Paper 2 Variant 1, question 1.

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