2024 SJI P2 Q6

2024 SJI P2 Q6

IB Year 5 | Grade 11
11 marks

A function \(\mathrm f\) is defined as \(\mathrm f(x)=3^x-\dfrac1{3^x}\), \(x\in\mathbb R\).

  1. Determine if \(\mathrm f\) is an even or odd function, or neither.[3]

Consider a one-one function \(\mathrm g\) such that \(\mathrm g(0)=1\) and \(\mathrm g'(0)=2\).

  1. Find the value of \((\mathrm f\circ\mathrm g)(0)\).[2]
  2. Find the value of \((\mathrm f\circ\mathrm g)'(0)\).[3]
  3. Find the value of \(x\) such that \((\mathrm g^{-1}\circ\mathrm f)(x)=0\).[3]

Solution:

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Answer:(a) Odd (b) \(\dfrac83\) (c) \(\dfrac{20}3\ln3=7.32\) (d) \(0.438\)

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