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A-LevelMathematicsAlgebra9709/12 · May/June 2019 · Q13 Marks

Find the coefficient of x in the expansion of (2/x - 3x)^5

  1. Find the coefficient of x in the expansion of (2/x - 3x)^5[3]

Mark scheme

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

  1. [B2,1] For (2/x - 3x)^5 term in x is 10 or 5C3 or 5C2 x (2/x)^2 x (-3x)^3 or (5.4.3/3!) (2/x)^2 (-3x)^3 or (5.4/2!) (2/x)^3 (-3x)^2
  2. [B1] -1080 identified

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About this question

Topic
Algebra, A-Level Mathematics (syllabus 9709). Structured question, 3 marks.
Source
A-Level Mathematics, May/June 2019 Paper 1 Variant 2, question 1.

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