AQA C3 2007 January — Question 3

Exam BoardAQA
ModuleC3 (Core Mathematics 3)
Year2007
SessionJanuary
TopicComposite & Inverse Functions

3 The functions \(f\) and \(g\) are defined with their respective domains by $$\begin{array} { l l } \mathrm { f } ( x ) = 3 - x ^ { 2 } , & \text { for all real values of } x
\mathrm {~g} ( x ) = \frac { 2 } { x + 1 } , & \text { for real values of } x , x \neq - 1 \end{array}$$
  1. Find the range of f.
  2. The inverse of g is \(\mathrm { g } ^ { - 1 }\).
    1. Find \(\mathrm { g } ^ { - 1 } ( x )\).
    2. State the range of \(\mathrm { g } ^ { - 1 }\).
  3. The composite function gf is denoted by h .
    1. Find \(\mathrm { h } ( x )\), simplifying your answer.
    2. State the greatest possible domain of h .