2025 VJC Promo Q12

2025 VJC Promo Q12

Junior College 1
14 marks

The function \(\mathrm{f}\) is defined by

  1. Sketch the graph of \(y=\mathrm{f}(x)\), giving the equations of the asymptotes and the coordinates of the axial intercepts. Hence show that \(\mathrm{f}\) is a one-one function.[3]

The diagram below shows the graph of \(y=\mathrm{g}(x)\). The curve cuts the axes at \(\left(0,\frac{1}{2}\right)\) and \((1,0)\), and also

passes through \((2,-3)\). It has asymptotes \(y=-6\) and \(y=6\).

  1. Find the value of \(\mathrm{g}\mathrm{f}^{-1}(6)\).[3]
  2. Explain why the function \(\mathrm{fg}\) does not exist.[1]

Another function \(\mathrm{h}\) is defined by

  1. On separate diagrams, sketch the graphs of
    1. \(y=\mathrm{h}(x)\),[3]
    2. \(y=\mathrm{h}^{-1}(x)\),[3]
    stating the equations of the asymptotes and the coordinates of any axial intercept.
  2. Describe the relationship between the graphs of \(y=\mathrm{h}(x)\) and \(y=\mathrm{h}^{-1}(x)\).[1]

Solution:

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Answer:\(\mathrm{g}\mathrm{f}^{-1}(6)=0\); \(\mathrm{fg}\) does not exist; \(\mathrm{h}\) and \(\mathrm{h}^{-1}\) are reflections in \(y=x\)

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