Edexcel C3 Specimen — Question 5

Exam BoardEdexcel
ModuleC3 (Core Mathematics 3)
SessionSpecimen
TopicModulus function

5. \begin{figure}[h]
\captionsetup{labelformat=empty} \caption{Figure 1} \includegraphics[alt={},max width=\textwidth]{937edb48-ef4c-4974-a571-60b0fded841b-3_394_680_982_680}
\end{figure} Figure 1 shows part of the curve with equation \(y = \mathrm { f } ( x ) , x \in \mathbb { R }\). The curve meets the \(x\)-axis at \(P ( p , 0 )\) and meets the \(y\)-axis at \(Q ( 0 , q )\).
  1. On separate diagrams, sketch the curve with equation
    1. \(y = | \mathrm { f } ( x ) |\),
    2. \(y = 3 \mathrm { f } \left( \frac { 1 } { 2 } x \right)\). In each case show, in terms of \(p\) or \(q\), the coordinates of points at which the curve meets the axes. Given that \(\mathrm { f } ( x ) = 3 \ln ( 2 x + 3 )\),
  2. state the exact value of \(q\),
  3. find the value of \(p\),
  4. find an equation for the tangent to the curve at \(P\).