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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 138

In this question you should assume that $−12<x<12\displaystyle -\frac{1}{2} < x < \frac{1}{2}$ .

a.

For the binomial expansion of $1 - 2x)^{-2}$ , find and simplify the first four terms.

[2]

b.

Write down the sum to infinity of the series $4x^2 + 8x^3 + \dots$

[1]

c.

Hence, or otherwise, find and simplify an expression for $16x^2 + 40x^3 + \dots$

[3]

Markscheme

3.4 Sequences and Series (A-level only) Questions

A Level
Maths
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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