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O-LevelAdditional MathematicsQuadratic functions4037/21 · May/June 2016 · Q13 Marks

Find the values of x for which (x - 4)(x + 2) > 7.

Find the values of x for which (x - 4)(x + 2) > 7.[3]

Mark scheme

Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.

[M1] expands and rearranges to form a 3 term quadratic
[A1] not from wrong working critical values -3 and 5
[A1] mark final inequality; A0 if spurious attempt to combine e.g. 5<x<-3 x < -3 x > 5

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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 2016 Paper 2 Variant 1, question 1.

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