2021 SJI P2 Q4

2021 SJI P2 Q4

IB Year 5 | Grade 11
7 marks

It is given that \(\mathrm{h}(x)=\dfrac1{\sqrt[3]{8-3x}}\).

    1. Find the binomial expansion for \(\mathrm{h}(x)\), in ascending powers of \(x\), up to and including the term in \(x^2\). Give the coefficients as exact fractions in their simplest form.
    2. State the range of values of \(x\) for which the expansion is valid.[4]
  1. By putting \(x=\dfrac1{16}\) into the expansion in (a)(i), find an approximate value of \(\sqrt[3]{16}\), as a fraction in its lowest terms, in the form \(\dfrac ab\), where \(a\) and \(b\) are integers.[3]

Solution:

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Answer:(a)(i) \(\dfrac12+\dfrac{x}{16}+\dfrac{x^2}{64}+\cdots\), (ii) \(-\dfrac83<x<\dfrac83\) (b) \(\dfrac{41285}{16384}\)

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