CAIE P1 2024 November — Question 10

Exam BoardCAIE
ModuleP1 (Pure Mathematics 1)
Year2024
SessionNovember
TopicIntegration by Substitution

10 A function f with domain \(x > 0\) is such that \(\mathrm { f } ^ { \prime } ( x ) = 8 ( 2 x - 3 ) ^ { \frac { 1 } { 3 } } - 10 x ^ { \frac { 2 } { 3 } }\). It is given that the curve with equation \(y = \mathrm { f } ( x )\) passes through the point \(( 1,0 )\).
  1. Find the equation of the normal to the curve at the point \(( 1,0 )\).
  2. Find \(\mathrm { f } ( x )\).
    \includegraphics[max width=\textwidth, alt={}, center]{39393c20-34df-4167-a8bf-e4067371de81-16_2715_41_110_2008}
    \includegraphics[max width=\textwidth, alt={}, center]{39393c20-34df-4167-a8bf-e4067371de81-17_2723_35_101_20} It is given that the equation \(\mathrm { f } ^ { \prime } ( x ) = 0\) can be expressed in the form $$125 x ^ { 2 } - 128 x + 192 = 0$$
  3. Determine, making your reasoning clear, whether f is an increasing function, a decreasing function or neither.
    If you use the following page to complete the answer to any question, the question number must be clearly shown.
    \includegraphics[max width=\textwidth, alt={}, center]{39393c20-34df-4167-a8bf-e4067371de81-18_2714_38_109_2010}