Edexcel P1 2019 January — Question 11

Exam BoardEdexcel
ModuleP1 (Pure Mathematics 1)
Year2019
SessionJanuary
TopicCurve Sketching
TypePolynomial intersection with algebra

11. (a) On Diagram 1 sketch the graphs of
  1. \(y = x ( 3 - x )\)
  2. \(y = x ( x - 2 ) ( 5 - x )\)
    showing clearly the coordinates of the points where the curves cross the coordinate axes.
    (b) Show that the \(x\) coordinates of the points of intersection of $$y = x ( 3 - x ) \text { and } y = x ( x - 2 ) ( 5 - x )$$ are given by the solutions to the equation \(x \left( x ^ { 2 } - 8 x + 13 \right) = 0\) The point \(P\) lies on both curves. Given that \(P\) lies in the first quadrant,
    (c) find, using algebra and showing your working, the exact coordinates of \(P\).
    \includegraphics[max width=\textwidth, alt={}]{c8f8d35d-c2dd-4a1f-a4bb-a4fa06413d12-23_824_1211_296_370}
    \section*{Diagram 1}