Exam-Style Problem

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Nov 2019 p31 q5
1845

The curve with equation \(y = e^{-2x} \ln(x-1)\) has a stationary point when \(x = p\).

  1. Show that \(p\) satisfies the equation \(x = 1 + \exp\left( \frac{1}{2(x-1)} \right)\), where \(\exp(x)\) denotes \(e^x\).
  2. Verify by calculation that \(p\) lies between 2.2 and 2.6.
  3. Use an iterative formula based on the equation in part (i) to determine \(p\) correct to 2 decimal places. Give the result of each iteration to 4 decimal places.
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