2020 SJI P1 Q6

2020 SJI P1 Q6

IB Year 5 | Grade 11
9 marks

The graph of a polynomial function \(y=\mathrm{f}(x)\) is shown below. The curve cuts the \(x\)-axis at \(x=-3\) and \(x=7\), cuts the \(y\)-axis at \(y=2\), and has a maximum point at \((5,5)\).

Diagram is not drawn to scale.

  1. On the set of axes below, sketch the graph of \(y=\dfrac1{\mathrm{f}(x)}\), labelling its asymptotes, turning points, and axial intercepts clearly.[5]
  1. On the set of axes below, sketch the graph of \(y=(\mathrm{f}(x))^2\), labelling its turning points and axial intercepts clearly.[4]

Solution:

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Answer:(a) Asymptotes \(x=-3,\ x=7,\ y=0\); minimum \(\left(5,\dfrac15\right)\); \(y\)-intercept \(\dfrac12\) (b) Minima \((-3,0),(7,0)\); maximum \((5,25)\); \(y\)-intercept \(4\)

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