2025 RI Promo Q4

2025 RI Promo Q4

Junior College 1
7 marks
  1. The diagram shows the curve \(y=\mathrm{f}(x)\), with turning points at \(A(3,\ 2.5)\) and \(B(0,\ 1)\). The lines \(y=1\) and \(x=-2\) are asymptotes of the curve.
    1. \(y=\mathrm{f}(x-2)+2\)[2]
    2. \(y=\mathrm{f}'(x)\)[3]
    On separate diagrams, sketch the following graphs, clearly stating the equations of the asymptotes and the coordinates of the points corresponding to \(A\) and \(B\) where appropriate.
  2. The parametric equations of a curve are given by \(x=t^2-2t,\ y=t^3-3t,\ t>0.\) The curve is reflected in the \(y\)-axis. Find the exact coordinates of the point(s) where the reflected curve intersects the \(x\)-axis.[2]

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Answer:(a)(i) \(A'(5,4.5)\), \(B'(2,3)\), asymptotes \(x=0\), \(y=3\) (a)(ii) zeros \((0,0),(3,0)\), asymptotes \(x=-2\), \(y=0\) (b) \((2\sqrt3-3,0)\)

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