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4.2 Expanding (a + bx)^n

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Question 4

A theoretical model for the refractive index μ\muμ of a specialized optical glass depends on the incident light wavelength λ\lambdaλ according to the relation

μ(λ)=(1625+25λ)−32 \mu(\lambda) = \left( \frac{16}{25} + \frac{2}{5}\lambda \right)^{-\frac{3}{2}} μ(λ)=(2516​+52​λ)−23​

Determine the range of values of λ\lambdaλ for which the binomial expansion of μ(λ)\mu(\lambda)μ(λ) in ascending powers of λ\lambdaλ is valid.

[3]
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4.2 Expanding (a + bx)^n Questions

  1. A Level
  2. /Maths
  3. /4.2 Expanding (a + bx)^n

99 exam-style questions on Edexcel A Level Maths 4.2 Expanding (a + bx)^n. Each one has a worked solution and a mark scheme showing where the marks go.

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