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Binomial Expansion

Binomial Expansion

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Question 57
a.

Find the first three terms of the expansion of (25+5x)−12\displaystyle (25 + 5x)^{-\frac{1}{2}}(25+5x)−21​ in ascending powers of xxx.

[4]
b.

The expansion of a+bx25+5x\displaystyle \frac{a + bx}{\sqrt{25 + 5x}}25+5x​a+bx​ is 2+x…2 + x \dots2+x… Find the values of the constants a a\,a and bbb.

[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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