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Binomial Expansion

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Question 138
a.

Show that 1(2+x)2=2−2(1+12x)−2\displaystyle \frac{1}{(2 + x)^2}=2^{-2}\left(1 + \frac{1}{2}x\right)^{-2}(2+x)21​=2−2(1+21​x)−2

[1]
b.

Work out the first three terms in the binomial expansion of 1(2+x)2\displaystyle \frac{1}{(2 + x)^2}(2+x)21​

[3]
c.

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

[1]
Markscheme

Binomial Expansion Questions

  1. A Level
  2. /Maths
  3. /Binomial Expansion

408 exam-style questions on Edexcel A Level Maths Binomial Expansion, covering 4.1 Expanding (1 + x)^n, 4.2 Expanding (a + bx)^n, and 4.3 Using Partial Fractions. Each one has a worked solution and a mark scheme showing where the marks go.

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