3 The function \(f\) is defined for all non-negative values of \(x\) by
$$f ( x ) = 3 + \sqrt { x }$$
- Evaluate ff(169).
- Find an expression for \(\mathrm { f } ^ { - 1 } ( \mathrm { x } )\) in terms of x .
- On a single diagram sketch the graphs of \(y = f ( x )\) and \(y = f ^ { - 1 } ( x )\), indicating how the two graphs are related.