Edexcel P4 2022 October — Question 5

Exam BoardEdexcel
ModuleP4 (Pure Mathematics 4)
Year2022
SessionOctober
TopicVolumes of Revolution

  1. In this question you must show all stages of your working.
Solutions relying entirely on calculator technology are not acceptable. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{032d2541-9905-4570-9584-9a144b02fde5-10_741_896_383_587} \captionsetup{labelformat=empty} \caption{Figure 2}
\end{figure} Figure 2 shows a sketch of part of the curve with equation $$y = \frac { 12 \sqrt { x } } { \left( 2 x ^ { 2 } + 3 \right) ^ { 1.5 } }$$ The region \(R\), shown shaded in Figure 2, is bounded by the curve, the line with equation \(x = \frac { 1 } { \sqrt { 2 } }\), the \(x\)-axis and the line with equation \(x = k\). This region is rotated through \(360 ^ { \circ }\) about the \(x\)-axis to form a solid of revolution. Given that the volume of this solid is \(\frac { 713 } { 648 } \pi\), use algebraic integration to find the exact value of the constant \(k\).