4.2 Expanding (a + bx)^n
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One of the terms in the binomial expansion of (2+bx)5(2 + bx)^5(2+bx)5, where b b\,b is a constant, is 720x2720x^2720x2.

a.

Find the possible values of bbb.

[3]
b.

Hence find the term independent of x x\,x in the expansion of (14+1x5)(2+bx)5\left( \frac{1}{4} + \frac{1}{x^5} \right) (2 + bx)^5(41​+x51​)(2+bx)5

[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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