2026 IGCSE Additional Mathematics May/June 0606/13 Q8

2026 IGCSE Additional Mathematics May/June 0606/13 Q8

8 marks

A function \(\mathrm{f}\) is defined by \(\mathrm{f}(x)=e^{2x+1}\) for \(x\in\mathbb{R}\).

  1. State the range of \(\mathrm{f}^{-1}\).[1]
  2. Find the domain of \(\mathrm{f}^{-1}\).[1]
  3. Find an expression for \(\mathrm{f}^{-1}(x)\).[2]
  4. On the axes, sketch the graph of \(y=\mathrm{f}(x)\) and hence sketch the graph of \(y=\mathrm{f}^{-1}(x)\).
    State the exact coordinates of any intercepts with the axes.[4]

Solution:

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Answer:(a) \(\mathbb R\) (b) \(x>0\) (c) \(\dfrac12(\ln x-1)\) (d) Graphs shown; intercepts \((0,e)\) for \(\mathrm f\) and \((e,0)\) for \(\mathrm f^{-1}\).

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