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3.4 Sequences and Series (A-level only)

3.4 Sequences and Series (A-level only)

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Question 78
a.

Expand (1+3x)−3(1+3x)^{-3}(1+3x)−3 in ascending powers of x x\,x up to and including x3x^3x3

[4]
b.

Write down the range of values of x x\,x for which the expansion is valid.

[1]
c.

Use your expansion to find the expansion of 2x+1(1+3x)3\displaystyle \frac{2x+1}{(1+3x)^3}(1+3x)32x+1​ up to and including x3x^3x3

[3]
Markscheme

3.4 Sequences and Series (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.4 Sequences and Series (A-level only)

231 exam-style questions on WJEC A Level Maths 3.4 Sequences and Series (A-level only), covering 3.4.1 Sequences and Series (A-level only), 3.4.2 Sequences and Series (A-level only), 3.4.3 Sequences and Series (A-level only), 3.4.4 Sequences and Series (A-level only), 3.4.5 Sequences and Series (A-level only), 3.4.6 Sequences and Series (A-level only), and 3.4.7 Sequences and Series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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