4.2 Expanding (a + bx)^n
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a.

Find the first three terms, in ascending powers of xxx, in the expansion of (3+kx)6(3 + kx)^6(3+kx)6 where kkk is a positive constant.

[3]
b.

Hence, given that the coefficient of x2x^2x2 is six times the coefficient of xxx, find the value of kkk.

[3]

4.2 Expanding (a + bx)^n Questions

Practise Edexcel A Level Maths 4.2 Expanding (a + bx)^n with exam-style questions for A Level Maths. 99 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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4.2 Expanding (a + bx)^n Questions

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