# C4 Exam Questions - Binomial Expansion

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A-Level Edexcel C4 January 2010
(a) Find the binomial expansion of
√(1 - 8x), |x| < 1/8.
in ascending powers of x up to and including the term in x3, simplifying each term.
(b) Show that, when x = 1/100 , the exact value of √(1 - 8x) is √23/5
(c) Substitute 1/100 into the binomial expansion in part (a) and hence obtain an approximation to √23. Give your answer to 5 decimal places

A-Level Edexcel C4 January 2010 Q1(a)
Worked solution to this question on the binomial expansion.

A-Level Edexcel C4 January 2010 Q1(b)
Worked solution to this question on the binomial expansion

A-Level Edexcel C4 January 2010 Q1(c)
Worked solution to this question on the binomial expansion

A-Level Edexcel C4 January 2009 Q3(b)
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