June 2022 Paper 3 Q3

3 The function f is defined by

\[\mathrm{f}(x) = 2x + 1\]

Solve the equation

\[\mathrm{f}(x) = \mathrm{f}^{-1}(x)\]

Circle your answer. [1 mark]

• \(x = -1\)
• \(x = 0\)
• \(x = 1\)
• \(x = 2\)