Find the first 4 terms, in ascending powers of xxx, of the binomial expansion of
(3−x9)9\left(3 - \frac{x}{9}\right)^9(3−9x)9
giving each term in its simplest form.
Hence find the constant term in the series expansion of
(2+1x)2(3−x9)9\left(2 + \frac{1}{x}\right)^2 \left(3 - \frac{x}{9}\right)^9(2+x1)2(3−9x)9
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.