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1.7.1 Binomial expansion

Find the coefficient of $x^5\,$ in the expansion of $2 + 3x)^7$ .

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b(i).

Expand $\sqrt{1 - 2x}\,$ in ascending powers of $x\,$ as far as the term in $x^3$ .

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b(ii).

State the range of values of $x\,$ for which your expansion is valid.

[1]

b(iii).

Use your expansion, with $x = 0.01$ , to find an estimate for $\sqrt{98}\,$ correct to five significant figures.

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1.7.1 Binomial expansion Questions

144 exam-style questions on AQA A Level Maths 1.7.1 Binomial expansion. Each one has a worked solution and a mark scheme showing where the marks go.