2025 CJC P2 Q1

2025 CJC P2 Q1

8 marks

The diagram shows the graphs of \(y = \mathrm{f}(|x|)\) and \(y = \mathrm{f}'(x)\).

The graph of \(y = \mathrm{f}(|x|)\) has turning points at \((-3, 4)\) and \((3, 4)\), crosses the \(x\)-axis at \((-2, 0)\) and \((2, 0)\), and the equations of asymptotes are \(x = -1\), \(x = 1\) and \(y = 2\). The graph of \(y = \mathrm{f}'(x)\) crosses the \(x\)-axis at \((3, 0)\), and the equations of asymptotes are \(x = 1\) and \(y = 0\).

On separate diagrams, sketch the graphs of

  1. \(y = \mathrm{f}(x)\),[2]
  2. \(y = \frac{1}{\mathrm{f}'(x)}\),[3]
  3. \(y = -\mathrm{f}(|x-1|)\),[3]

labelling clearly the equation(s) of any asymptote(s), coordinates of any axial intercept(s) and turning point(s) where applicable.

Solution:

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Answer:(a) Sketch shown: intercepts \((0,0),(2,0)\), maximum \((3,4)\), asymptotes \(x=1\) and right-hand \(y=2\). (b) Sketch shown: asymptote\(x=3\), excluded hole \((1,0)\), no x-intercepts. (c) Sketch shown: asymptotes \(x=0,2\),\(y=-2\); zeros\(-1,1,3\), minima\((-2,-4),(1,0),(4,-4)\), with a cusp at \((1,0)\).

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