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Binomial Expansion

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Question 266
a.

Show that the first three terms, in descending powers of xxx, of the expansion of

(3x−2)8 (3x - 2)^8 (3x−2)8

are given by

6561x8+ax7+bx6 6561x^8 + ax^7 + bx^6 6561x8+ax7+bx6

where aaa and bbb are integers to be found.

[3]
b.

Find the constant term in the expansion of

(3x−2x)8 \left(3x - \frac{2}{x}\right)^8 (3x−x2​)8
[3]
Markscheme

Binomial Expansion Questions

  1. A Level
  2. /Maths
  3. /Binomial Expansion

408 exam-style questions on Edexcel A Level Maths Binomial Expansion, covering 4.1 Expanding (1 + x)^n, 4.2 Expanding (a + bx)^n, and 4.3 Using Partial Fractions. Each one has a worked solution and a mark scheme showing where the marks go.

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